diff --git a/jso/impl/src/main/java/org/teavm/jso/impl/JSClassProcessor.java b/jso/impl/src/main/java/org/teavm/jso/impl/JSClassProcessor.java
index b6da7c20d..121b13c2f 100644
--- a/jso/impl/src/main/java/org/teavm/jso/impl/JSClassProcessor.java
+++ b/jso/impl/src/main/java/org/teavm/jso/impl/JSClassProcessor.java
@@ -25,6 +25,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.function.Predicate;
 import org.mozilla.javascript.CompilerEnvirons;
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.ast.AstRoot;
@@ -109,6 +110,7 @@ class JSClassProcessor {
     private IncrementalDependencyRegistration incrementalCache;
     private JSImportAnnotationCache annotationCache;
     private ClassReader objectClass;
+    private Predicate<String> classFilter = n -> true;
 
     JSClassProcessor(ClassReaderSource classSource, JSTypeHelper typeHelper, JSBodyRepository repository,
             Diagnostics diagnostics, IncrementalDependencyRegistration incrementalCache, boolean strict) {
@@ -123,6 +125,10 @@ class JSClassProcessor {
         annotationCache = new JSImportAnnotationCache(classSource, diagnostics);
     }
 
+    public void setClassFilter(Predicate<String> classFilter) {
+        this.classFilter = classFilter;
+    }
+
     public ClassReaderSource getClassSource() {
         return classSource;
     }
@@ -760,6 +766,9 @@ class JSClassProcessor {
 
     private boolean processJSBodyInvocation(MethodReader method, CallLocation callLocation, InvokeInstruction invoke,
             MethodHolder methodToProcess) {
+        if (!classFilter.test(method.getOwnerName())) {
+            return false;
+        }
         boolean[] byRefParams = new boolean[method.parameterCount()];
         validateSignature(method, callLocation, byRefParams);
         if (invoke.getInstance() != null) {
diff --git a/jso/impl/src/main/java/org/teavm/jso/impl/JSOPlugin.java b/jso/impl/src/main/java/org/teavm/jso/impl/JSOPlugin.java
index 2d62ed117..ec20ac87f 100644
--- a/jso/impl/src/main/java/org/teavm/jso/impl/JSOPlugin.java
+++ b/jso/impl/src/main/java/org/teavm/jso/impl/JSOPlugin.java
@@ -39,7 +39,8 @@ public class JSOPlugin implements TeaVMPlugin {
 
         JSBodyRepository repository = new JSBodyRepository();
         host.registerService(JSBodyRepository.class, repository);
-        host.add(new JSObjectClassTransformer(repository));
+        var classTransformer = new JSObjectClassTransformer(repository);
+        host.add(classTransformer);
         JSDependencyListener dependencyListener = new JSDependencyListener(repository);
         host.add(dependencyListener);
         host.add(new JSExceptionsDependencyListener());
@@ -59,6 +60,7 @@ public class JSOPlugin implements TeaVMPlugin {
         }
 
         if (wasmGCHost != null) {
+            classTransformer.setClassFilter(n -> !n.startsWith("java."));
             WasmGCJso.install(host, wasmGCHost, repository);
         }
     }
diff --git a/jso/impl/src/main/java/org/teavm/jso/impl/JSObjectClassTransformer.java b/jso/impl/src/main/java/org/teavm/jso/impl/JSObjectClassTransformer.java
index cc4d8a398..cc77ca901 100644
--- a/jso/impl/src/main/java/org/teavm/jso/impl/JSObjectClassTransformer.java
+++ b/jso/impl/src/main/java/org/teavm/jso/impl/JSObjectClassTransformer.java
@@ -22,6 +22,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.function.Predicate;
 import org.teavm.diagnostics.Diagnostics;
 import org.teavm.jso.JSClass;
 import org.teavm.jso.JSExport;
@@ -59,11 +60,16 @@ class JSObjectClassTransformer implements ClassHolderTransformer {
     private JSTypeHelper typeHelper;
     private ClassHierarchy hierarchy;
     private Map<String, ExposedClass> exposedClasses = new HashMap<>();
+    private Predicate<String> classFilter = n -> true;
 
     JSObjectClassTransformer(JSBodyRepository repository) {
         this.repository = repository;
     }
 
+    void setClassFilter(Predicate<String> classFilter) {
+        this.classFilter = classFilter;
+    }
+
     @Override
     public void transformClass(ClassHolder cls, ClassHolderTransformerContext context) {
         this.hierarchy = context.getHierarchy();
@@ -71,6 +77,7 @@ class JSObjectClassTransformer implements ClassHolderTransformer {
             typeHelper = new JSTypeHelper(hierarchy.getClassSource());
             processor = new JSClassProcessor(hierarchy.getClassSource(), typeHelper, repository,
                     context.getDiagnostics(), context.getIncrementalCache(), context.isStrict());
+            processor.setClassFilter(classFilter);
         }
         processor.processClass(cls);
         if (typeHelper.isJavaScriptClass(cls.getName())) {