diff --git a/core/src/main/java/org/teavm/backend/wasm/disasm/DisassemblyImportSectionListener.java b/core/src/main/java/org/teavm/backend/wasm/disasm/DisassemblyImportSectionListener.java
index d6e08b5ca..7b2a27074 100644
--- a/core/src/main/java/org/teavm/backend/wasm/disasm/DisassemblyImportSectionListener.java
+++ b/core/src/main/java/org/teavm/backend/wasm/disasm/DisassemblyImportSectionListener.java
@@ -89,7 +89,7 @@ public class DisassemblyImportSectionListener extends BaseDisassemblyListener im
     }
 
     @Override
-    public void global(WasmHollowType type) {
+    public void global(WasmHollowType type, boolean mutable) {
         writer.address().write("(import \"").write(currentModule).write("\" \"")
                 .write(currentName).write("\" ");
         writer.write("(global ");
@@ -99,9 +99,15 @@ public class DisassemblyImportSectionListener extends BaseDisassemblyListener im
             writer.write(" $").write(name);
         }
         writer.endLinkTarget();
-        writer.write(" (type ");
+        writer.write(" ");
+        if (mutable) {
+            writer.write("(mut ");
+        }
         writeType(type);
-        writer.write("))").eol();
+        if (mutable) {
+            writer.write(")");
+        }
+        writer.write(")").eol();
         ++globalIndex;
     }
 }
diff --git a/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationContext.java b/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationContext.java
index c01f54891..2a1c9395d 100644
--- a/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationContext.java
+++ b/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationContext.java
@@ -37,6 +37,7 @@ import org.teavm.backend.wasm.model.WasmFunction;
 import org.teavm.backend.wasm.model.WasmModule;
 import org.teavm.backend.wasm.model.WasmTag;
 import org.teavm.backend.wasm.runtime.gc.WasmGCSupport;
+import org.teavm.diagnostics.Diagnostics;
 import org.teavm.model.ClassHierarchy;
 import org.teavm.model.ClassReaderSource;
 import org.teavm.model.ElementModifier;
@@ -67,6 +68,7 @@ public class WasmGCGenerationContext implements BaseWasmGenerationContext {
     private boolean strict;
     private String entryPoint;
     private Consumer<WasmGCInitializerContributor> initializerContributors;
+    private Diagnostics diagnostics;
 
     public WasmGCGenerationContext(WasmModule module, WasmGCVirtualTableProvider virtualTables,
             WasmGCTypeMapper typeMapper, WasmFunctionTypes functionTypes, ListableClassReaderSource classes,
@@ -75,7 +77,8 @@ public class WasmGCGenerationContext implements BaseWasmGenerationContext {
             WasmGCStandardClasses standardClasses, WasmGCStringProvider strings,
             WasmGCCustomGeneratorProvider customGenerators, WasmGCIntrinsicProvider intrinsics,
             WasmGCNameProvider names, boolean strict, String entryPoint,
-            Consumer<WasmGCInitializerContributor> initializerContributors) {
+            Consumer<WasmGCInitializerContributor> initializerContributors,
+            Diagnostics diagnostics) {
         this.module = module;
         this.virtualTables = virtualTables;
         this.typeMapper = typeMapper;
@@ -94,6 +97,7 @@ public class WasmGCGenerationContext implements BaseWasmGenerationContext {
         this.strict = strict;
         this.entryPoint = entryPoint;
         this.initializerContributors = initializerContributors;
+        this.diagnostics = diagnostics;
     }
 
     public WasmGCClassInfoProvider classInfoProvider() {
@@ -202,6 +206,10 @@ public class WasmGCGenerationContext implements BaseWasmGenerationContext {
         return intrinsics;
     }
 
+    public Diagnostics diagnostics() {
+        return diagnostics;
+    }
+
     public Collection<String> getInterfaceImplementors(String className) {
         if (interfaceImplementors == null) {
             fillInterfaceImplementors();
diff --git a/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationVisitor.java b/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationVisitor.java
index 3da315056..64457d4e3 100644
--- a/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationVisitor.java
+++ b/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCGenerationVisitor.java
@@ -84,6 +84,7 @@ import org.teavm.backend.wasm.model.expression.WasmTest;
 import org.teavm.backend.wasm.model.expression.WasmThrow;
 import org.teavm.backend.wasm.model.expression.WasmUnreachable;
 import org.teavm.backend.wasm.runtime.StringInternPool;
+import org.teavm.diagnostics.Diagnostics;
 import org.teavm.model.ClassHierarchy;
 import org.teavm.model.ElementModifier;
 import org.teavm.model.FieldReference;
@@ -849,6 +850,16 @@ public class WasmGCGenerationVisitor extends BaseWasmGenerationVisitor {
             return context.entryPoint();
         }
 
+        @Override
+        public Diagnostics diagnostics() {
+            return context.diagnostics();
+        }
+
+        @Override
+        public MethodReference currentMethod() {
+            return currentMethod;
+        }
+
         @Override
         public void addToInitializer(Consumer<WasmFunction> initializerContributor) {
             context.addToInitializer(initializerContributor);
diff --git a/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCMethodGenerator.java b/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCMethodGenerator.java
index 6e2b7f5a1..6365d7cd1 100644
--- a/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCMethodGenerator.java
+++ b/core/src/main/java/org/teavm/backend/wasm/generate/gc/methods/WasmGCMethodGenerator.java
@@ -366,7 +366,8 @@ public class WasmGCMethodGenerator implements BaseWasmFunctionRepository {
                     names,
                     strict,
                     entryPoint,
-                    initializerContributors
+                    initializerContributors,
+                    diagnostics
             );
         }
         return context;
diff --git a/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsicContext.java b/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsicContext.java
index 32e4f8b68..b362dc9c6 100644
--- a/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsicContext.java
+++ b/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsicContext.java
@@ -30,7 +30,9 @@ import org.teavm.backend.wasm.model.WasmFunction;
 import org.teavm.backend.wasm.model.WasmModule;
 import org.teavm.backend.wasm.model.WasmTag;
 import org.teavm.backend.wasm.model.expression.WasmExpression;
+import org.teavm.diagnostics.Diagnostics;
 import org.teavm.model.ClassHierarchy;
+import org.teavm.model.MethodReference;
 
 public interface WasmGCIntrinsicContext {
     WasmExpression generate(Expr expr);
@@ -63,5 +65,9 @@ public interface WasmGCIntrinsicContext {
 
     String entryPoint();
 
+    Diagnostics diagnostics();
+
+    MethodReference currentMethod();
+
     void addToInitializer(Consumer<WasmFunction> initializerContributor);
 }
diff --git a/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionListener.java b/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionListener.java
index cc997d8f0..dbe910ef5 100644
--- a/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionListener.java
+++ b/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionListener.java
@@ -22,7 +22,7 @@ public interface ImportSectionListener {
     default void function(int typeIndex) {
     }
 
-    default void global(WasmHollowType type) {
+    default void global(WasmHollowType type, boolean mutable) {
     }
 
     default void endEntry() {
diff --git a/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionParser.java b/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionParser.java
index 4b2e2fbf4..fd0bf0c59 100644
--- a/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionParser.java
+++ b/core/src/main/java/org/teavm/backend/wasm/parser/ImportSectionParser.java
@@ -45,7 +45,7 @@ public class ImportSectionParser extends BaseSectionParser {
             }
             case 3: {
                 var valueType = reader.readType();
-                listener.global(valueType);
+                listener.global(valueType, reader.readLEB() != 0);
                 break;
             }
             default:
diff --git a/core/src/main/js/wasm-gc-runtime/runtime.js b/core/src/main/js/wasm-gc-runtime/runtime.js
index 5aee92941..40f287f4c 100644
--- a/core/src/main/js/wasm-gc-runtime/runtime.js
+++ b/core/src/main/js/wasm-gc-runtime/runtime.js
@@ -619,7 +619,7 @@ async function wrapImports(wasmModule, imports) {
         if (names === void 0) {
             let namesByModule = [];
             names = namesByModule;
-            propertiesToAdd[name] = names;
+            propertiesToAdd[module] = names;
             promises.push((async () => {
                 let moduleInstance = await import(module);
                 let importsByModule = {};
diff --git a/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJSIntrinsic.java b/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJSIntrinsic.java
index bc5badff3..41ad1995c 100644
--- a/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJSIntrinsic.java
+++ b/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJSIntrinsic.java
@@ -29,11 +29,14 @@ import org.teavm.backend.wasm.model.expression.WasmBlock;
 import org.teavm.backend.wasm.model.expression.WasmBranch;
 import org.teavm.backend.wasm.model.expression.WasmCall;
 import org.teavm.backend.wasm.model.expression.WasmExpression;
+import org.teavm.backend.wasm.model.expression.WasmGetGlobal;
 import org.teavm.backend.wasm.model.expression.WasmIsNull;
 import org.teavm.backend.wasm.model.expression.WasmThrow;
 import org.teavm.backend.wasm.runtime.gc.WasmGCSupport;
 import org.teavm.jso.JSObject;
 import org.teavm.jso.impl.JS;
+import org.teavm.jso.impl.JSMethods;
+import org.teavm.model.CallLocation;
 import org.teavm.model.MethodReference;
 import org.teavm.model.ValueType;
 
@@ -49,7 +52,6 @@ class WasmGCJSIntrinsic implements WasmGCIntrinsic {
 
     @Override
     public WasmExpression apply(InvocationExpr invocation, WasmGCIntrinsicContext context) {
-        var jsoContext = WasmGCJsoContext.wrap(context);
         switch (invocation.getMethod().getName()) {
             case "wrap":
                 return wrapString(invocation.getArguments().get(0), context);
@@ -69,13 +71,79 @@ class WasmGCJSIntrinsic implements WasmGCIntrinsic {
                 return arrayItem(invocation, context);
             case "get":
             case "getPure":
-                return new WasmCall(functions.getGet(jsoContext), context.generate(invocation.getArguments().get(0)),
-                        context.generate(invocation.getArguments().get(1)));
+                return getProperty(invocation, context);
+            case "importModule":
+                return importModule(invocation, context);
             default:
                 throw new IllegalArgumentException();
         }
     }
 
+    private WasmExpression getProperty(InvocationExpr invocation, WasmGCIntrinsicContext context) {
+        var result = tryGetFromModule(invocation, context);
+        if (result != null) {
+            return result;
+        }
+        var jsoContext = WasmGCJsoContext.wrap(context);
+        return new WasmCall(functions.getGet(jsoContext), context.generate(invocation.getArguments().get(0)),
+                context.generate(invocation.getArguments().get(1)));
+    }
+
+    private WasmExpression tryGetFromModule(InvocationExpr invocation, WasmGCIntrinsicContext context) {
+        var target = invocation.getArguments().get(0);
+        if (!(target instanceof InvocationExpr)) {
+            return null;
+        }
+        var targetCall = (InvocationExpr) target;
+        if (!targetCall.getMethod().equals(JSMethods.IMPORT_MODULE)) {
+            return null;
+        }
+        var moduleName = extractString(targetCall.getArguments().get(0));
+        if (moduleName == null) {
+            return null;
+        }
+
+        var property = invocation.getArguments().get(1);
+        if (!(property instanceof InvocationExpr)) {
+            return null;
+        }
+        var propertyCall = (InvocationExpr) property;
+        if (!propertyCall.getMethod().equals(JSMethods.WRAP_STRING)) {
+            return null;
+        }
+        var name = extractString(propertyCall.getArguments().get(0));
+        if (name == null) {
+            return null;
+        }
+
+        var jsoContext = WasmGCJsoContext.wrap(context);
+        var global = commonGen.getImportGlobal(jsoContext, moduleName, name);
+        return new WasmGetGlobal(global);
+    }
+
+    private WasmExpression importModule(InvocationExpr invocation, WasmGCIntrinsicContext context) {
+        var jsoContext = WasmGCJsoContext.wrap(context);
+        var nameArg = invocation.getArguments().get(0);
+        var name = extractString(nameArg);
+        if (name == null) {
+            context.diagnostics().error(new CallLocation(context.currentMethod(), invocation.getLocation()),
+                    "Invalid JS module import call");
+        }
+        var global = commonGen.getImportGlobal(jsoContext, name, "__self__");
+        return new WasmGetGlobal(global);
+    }
+
+    private String extractString(Expr expr) {
+        if (!(expr instanceof ConstantExpr)) {
+            return null;
+        }
+        var constant = ((ConstantExpr) expr).getValue();
+        if (!(constant instanceof String)) {
+            return null;
+        }
+        return (String) constant;
+    }
+
     private WasmExpression wrapString(Expr stringExpr, WasmGCIntrinsicContext context) {
         if (stringExpr instanceof ConstantExpr) {
             var constantExpr = (ConstantExpr) stringExpr;
diff --git a/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJso.java b/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJso.java
index 2072e64a3..d160e5238 100644
--- a/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJso.java
+++ b/jso/impl/src/main/java/org/teavm/jso/impl/wasmgc/WasmGCJso.java
@@ -57,6 +57,8 @@ public final class WasmGCJso {
                 jsIntrinsic);
         wasmGCHost.addIntrinsic(new MethodReference(JS.class, "getPure", JSObject.class, JSObject.class,
                 JSObject.class), jsIntrinsic);
+        wasmGCHost.addIntrinsic(new MethodReference(JS.class, "importModule", String.class, JSObject.class),
+                jsIntrinsic);
 
         var wrapperIntrinsic = new WasmGCJSWrapperIntrinsic();
         wasmGCHost.addIntrinsic(new MethodReference(JSWrapper.class, "wrap", JSObject.class, Object.class),
diff --git a/tests/src/test/java/org/teavm/jso/test/ImportModuleTest.java b/tests/src/test/java/org/teavm/jso/test/ImportModuleTest.java
index fa4fbf98a..bf776c86f 100644
--- a/tests/src/test/java/org/teavm/jso/test/ImportModuleTest.java
+++ b/tests/src/test/java/org/teavm/jso/test/ImportModuleTest.java
@@ -26,6 +26,7 @@ import org.teavm.junit.JsModuleTest;
 import org.teavm.junit.OnlyPlatform;
 import org.teavm.junit.ServeJS;
 import org.teavm.junit.SkipJVM;
+import org.teavm.junit.SkipPlatform;
 import org.teavm.junit.TeaVMTestRunner;
 import org.teavm.junit.TestPlatform;
 
@@ -39,14 +40,14 @@ public class ImportModuleTest {
             "org/teavm/jso/test/amd.js",
             "org/teavm/jso/test/amdModule.js"
     })
-    @OnlyPlatform(TestPlatform.JAVASCRIPT)
+    @SkipPlatform(TestPlatform.WEBASSEMBLY_GC)
     public void amd() {
         assertEquals(23, runTestFunction());
     }
 
     @Test
     @AttachJavaScript("org/teavm/jso/test/commonjs.js")
-    @OnlyPlatform(TestPlatform.JAVASCRIPT)
+    @SkipPlatform(TestPlatform.WEBASSEMBLY_GC)
     public void commonjs() {
         assertEquals(23, runTestFunction());
     }
@@ -54,7 +55,6 @@ public class ImportModuleTest {
     @Test
     @JsModuleTest
     @ServeJS(from = "org/teavm/jso/test/es2015.js", as = "testModule.js")
-    @OnlyPlatform({TestPlatform.JAVASCRIPT, TestPlatform.WEBASSEMBLY_GC})
     public void es2015() {
         assertEquals(23, runTestFunction());
     }
@@ -62,7 +62,6 @@ public class ImportModuleTest {
     @Test
     @JsModuleTest
     @ServeJS(from = "org/teavm/jso/test/classWithConstructorInModule.js", as = "testModule.js")
-    @OnlyPlatform(TestPlatform.JAVASCRIPT)
     public void classConstructor() {
         var o = new ClassWithConstructorInModule();
         assertEquals(99, o.getFoo());
@@ -75,7 +74,6 @@ public class ImportModuleTest {
     @Test
     @JsModuleTest
     @ServeJS(from = "org/teavm/jso/test/classWithConstructorInModule.js", as = "testModule.js")
-    @OnlyPlatform(TestPlatform.JAVASCRIPT)
     public void topLevel() {
         assertEquals("top level", ClassWithConstructorInModule.topLevelFunction());
         assertEquals("top level prop", ClassWithConstructorInModule.getTopLevelProperty());