diff --git a/core/src/main/java/org/teavm/backend/c/generate/ClassGenerator.java b/core/src/main/java/org/teavm/backend/c/generate/ClassGenerator.java
index 6b7d0ec9e..397c35d54 100644
--- a/core/src/main/java/org/teavm/backend/c/generate/ClassGenerator.java
+++ b/core/src/main/java/org/teavm/backend/c/generate/ClassGenerator.java
@@ -740,12 +740,24 @@ public class ClassGenerator {
                 sizeExpr = "0";
             }
             if (cls != null) {
-                if (cls.hasModifier(ElementModifier.ENUM)) {
-                    flags |= RuntimeClass.ENUM;
+                if (cls.hasModifier(ElementModifier.ABSTRACT)) {
+                    flags |= RuntimeClass.ABSTRACT;
+                }
+                if (cls.hasModifier(ElementModifier.INTERFACE)) {
+                    flags |= RuntimeClass.INTERFACE;
+                }
+                if (cls.hasModifier(ElementModifier.FINAL)) {
+                    flags |= RuntimeClass.FINAL;
+                }
+                if (cls.hasModifier(ElementModifier.ANNOTATION)) {
+                    flags |= RuntimeClass.ANNOTATION;
                 }
                 if (cls.hasModifier(ElementModifier.SYNTHETIC)) {
                     flags |= RuntimeClass.SYNTHETIC;
                 }
+                if (cls.hasModifier(ElementModifier.ENUM)) {
+                    flags |= RuntimeClass.ENUM;
+                }
             }
             List<TagRegistry.Range> ranges = tagRegistry != null ? tagRegistry.getRanges(className) : null;
             tag = !context.isIncremental() && ranges != null && !ranges.isEmpty() ? ranges.get(0).lower : 0;
diff --git a/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassIntrinsic.java b/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassIntrinsic.java
index 26bd02bd6..75440d1a9 100644
--- a/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassIntrinsic.java
+++ b/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassIntrinsic.java
@@ -45,6 +45,7 @@ public class PlatformClassIntrinsic implements Intrinsic {
                 break;
             case "setJavaClass":
                 break;
+            case "getFlags":
         }
     }
 }
diff --git a/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassMetadataIntrinsic.java b/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassMetadataIntrinsic.java
index 82a4a7ea8..138a6a432 100644
--- a/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassMetadataIntrinsic.java
+++ b/core/src/main/java/org/teavm/backend/c/intrinsic/PlatformClassMetadataIntrinsic.java
@@ -34,6 +34,8 @@ public class PlatformClassMetadataIntrinsic implements Intrinsic {
             RuntimeClass.class.getName(), "declaringClass");
     private static final FieldReference ENCLOSING_CLASS_FIELD = new FieldReference(
             RuntimeClass.class.getName(), "enclosingClass");
+    private static final FieldReference FLAGS_FIELD = new FieldReference(
+            RuntimeClass.class.getName(), "flags");
 
     @Override
     public boolean canHandle(MethodReference method) {
@@ -47,6 +49,7 @@ public class PlatformClassMetadataIntrinsic implements Intrinsic {
             case "getSimpleName":
             case "getDeclaringClass":
             case "getEnclosingClass":
+            case "getFlags":
                 return true;
         }
         return false;
@@ -81,6 +84,11 @@ public class PlatformClassMetadataIntrinsic implements Intrinsic {
             case "getEnclosingClass":
                 printFieldAccess(context, invocation, ENCLOSING_CLASS_FIELD);
                 break;
+            case "getFlags":
+                context.writer().print("(");
+                printFieldAccess(context, invocation, FLAGS_FIELD);
+                context.writer().print(" >> " + RuntimeClass.FLAGS_SHIFT + ")");
+                break;
         }
     }
 
diff --git a/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformClassMetadataIntrinsic.java b/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformClassMetadataIntrinsic.java
index 65ff99b94..c56d83c45 100644
--- a/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformClassMetadataIntrinsic.java
+++ b/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformClassMetadataIntrinsic.java
@@ -18,6 +18,10 @@ package org.teavm.backend.wasm.intrinsics;
 import org.teavm.ast.InvocationExpr;
 import org.teavm.ast.QualificationExpr;
 import org.teavm.backend.wasm.model.expression.WasmExpression;
+import org.teavm.backend.wasm.model.expression.WasmInt32Constant;
+import org.teavm.backend.wasm.model.expression.WasmIntBinary;
+import org.teavm.backend.wasm.model.expression.WasmIntBinaryOperation;
+import org.teavm.backend.wasm.model.expression.WasmIntType;
 import org.teavm.backend.wasm.model.expression.WasmUnreachable;
 import org.teavm.model.FieldReference;
 import org.teavm.model.MethodReference;
@@ -32,6 +36,7 @@ public class PlatformClassMetadataIntrinsic implements WasmIntrinsic {
     private static final FieldReference SIMPLE_NAME_FIELD = new FieldReference(RUNTIME_CLASS, "simpleName");
     private static final FieldReference ENCLOSING_CLASS_FIELD = new FieldReference(RUNTIME_CLASS, "enclosingClass");
     private static final FieldReference DECLARING_CLASS_FIELD = new FieldReference(RUNTIME_CLASS, "declaringClass");
+    private static final FieldReference FLAGS_FIELD = new FieldReference(RUNTIME_CLASS, "flags");
 
     @Override
     public boolean isApplicable(MethodReference methodReference) {
@@ -45,6 +50,7 @@ public class PlatformClassMetadataIntrinsic implements WasmIntrinsic {
             case "getSimpleName":
             case "getEnclosingClass":
             case "getDeclaringClass":
+            case "getFlags":
                 return true;
         }
         return false;
@@ -65,6 +71,11 @@ public class PlatformClassMetadataIntrinsic implements WasmIntrinsic {
                 return fieldAccess(manager, invocation, ENCLOSING_CLASS_FIELD);
             case "getDeclaringClass":
                 return fieldAccess(manager, invocation, DECLARING_CLASS_FIELD);
+            case "getFlags": {
+                var flags = fieldAccess(manager, invocation, FLAGS_FIELD);
+                return new WasmIntBinary(WasmIntType.INT32, WasmIntBinaryOperation.SHR_UNSIGNED, flags,
+                        new WasmInt32Constant(RuntimeClass.FLAGS_SHIFT));
+            }
             default:
                 return new WasmUnreachable();
         }
diff --git a/core/src/main/java/org/teavm/runtime/RuntimeClass.java b/core/src/main/java/org/teavm/runtime/RuntimeClass.java
index ae6fede67..45aa4afd5 100644
--- a/core/src/main/java/org/teavm/runtime/RuntimeClass.java
+++ b/core/src/main/java/org/teavm/runtime/RuntimeClass.java
@@ -21,14 +21,29 @@ import org.teavm.interop.Unmanaged;
 public class RuntimeClass extends RuntimeObject {
     public static final int INITIALIZED = 1;
     public static final int PRIMITIVE = 2;
-    public static final int ENUM = 4;
-    public static final int SYNTHETIC = 1024;
 
-    public static final int PRIMITIVE_SHIFT = 3;
+    public static final int PRIMITIVE_SHIFT = 2;
     public static final int PRIMITIVE_MASK = 15;
-    public static final int VM_TYPE_SHIFT = 7;
+    public static final int VM_TYPE_SHIFT = 6;
     public static final int VM_TYPE_MASK = 7;
 
+    public static final int FLAGS_SHIFT = 9;
+    public static final int ABSTRACT = 1 << FLAGS_SHIFT;
+    public static final int INTERFACE = 1 << (FLAGS_SHIFT + 1);
+    public static final int FINAL = 1 << (FLAGS_SHIFT + 2);
+    public static final int ENUM = 1 << (FLAGS_SHIFT + 3);
+    public static final int ANNOTATION = 1 << (FLAGS_SHIFT + 4);
+    public static final int SYNTHETIC = 1 << (FLAGS_SHIFT + 5);
+    public static final int BRIDGE = 1 << (FLAGS_SHIFT + 6);
+    public static final int DEPRECATED = 1 << (FLAGS_SHIFT + 7);
+    public static final int NATIVE = 1 << (FLAGS_SHIFT + 8);
+    public static final int STATIC = 1 << (FLAGS_SHIFT + 9);
+    public static final int STRICT = 1 << (FLAGS_SHIFT + 10);
+    public static final int SYNCHRONIZED = 1 << (FLAGS_SHIFT + 11);
+    public static final int TRANSIENT = 1 << (FLAGS_SHIFT + 12);
+    public static final int VARARGS = 1 << (FLAGS_SHIFT + 13);
+    public static final int VOLATILE = 1 << (FLAGS_SHIFT + 14);
+
     public static final int BOOLEAN_PRIMITIVE = 0;
     public static final int BYTE_PRIMITIVE = 1;
     public static final int SHORT_PRIMITIVE = 2;
diff --git a/tests/src/test/java/org/teavm/classlib/java/lang/ClassTest.java b/tests/src/test/java/org/teavm/classlib/java/lang/ClassTest.java
index d5a983e68..44c8b2260 100644
--- a/tests/src/test/java/org/teavm/classlib/java/lang/ClassTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/lang/ClassTest.java
@@ -32,7 +32,6 @@ import org.teavm.junit.TeaVMTestRunner;
 import org.teavm.junit.TestPlatform;
 
 @RunWith(TeaVMTestRunner.class)
-@SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY, TestPlatform.WASI})
 public class ClassTest {
     @Test
     public void classNameEvaluated() {
@@ -115,6 +114,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY, TestPlatform.WASI})
     public void instanceCreatedThroughReflection() throws Exception {
         Runnable instance = (Runnable) Class.forName(TestObject.class.getName()).newInstance();
         instance.run();
@@ -123,6 +123,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY, TestPlatform.WASI})
     public void instanceCreatedThoughReflectionWithConstantName() throws Exception {
         var cls = Class.forName("org.teavm.classlib.java.lang.ClassTest$ClassReferredByConstantName");
         assertArrayEquals(new Class<?>[] { Supplier.class }, cls.getInterfaces());
@@ -137,6 +138,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY, TestPlatform.WASI})
     public void instanceCreatedThroughReflectionAsync() throws Exception {
         Runnable instance = TestObjectAsync.class.newInstance();
         instance.run();
@@ -178,6 +180,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY})
     public void annotationsExposed() {
         Annotation[] annotations = A.class.getAnnotations();
         assertEquals(1, annotations.length);
@@ -185,6 +188,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY})
     public void annotationFieldsExposed() {
         AnnotWithDefaultField annot = B.class.getAnnotation(AnnotWithDefaultField.class);
         assertEquals(2, annot.x());
@@ -193,6 +197,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY})
     public void annotationFieldTypesSupported() {
         AnnotWithVariousFields annot = D.class.getAnnotation(AnnotWithVariousFields.class);
         assertEquals(true, annot.a());
@@ -213,6 +218,7 @@ public class ClassTest {
     }
 
     @Test
+    @SkipPlatform({TestPlatform.C, TestPlatform.WEBASSEMBLY})
     public void getInterfaces() {
         assertEquals(0, SuperclassWithoutInterfaces.class.getInterfaces().length);
         assertEquals(Set.of(TestInterface1.class, TestInterface2.class),
diff --git a/tests/src/test/java/org/teavm/classlib/java/util/EnumMapTest.java b/tests/src/test/java/org/teavm/classlib/java/util/EnumMapTest.java
index 64ff7b84b..e3b782925 100644
--- a/tests/src/test/java/org/teavm/classlib/java/util/EnumMapTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/util/EnumMapTest.java
@@ -36,9 +36,7 @@ import java.util.Objects;
 import java.util.Set;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.teavm.junit.SkipPlatform;
 import org.teavm.junit.TeaVMTestRunner;
-import org.teavm.junit.TestPlatform;
 
 @RunWith(TeaVMTestRunner.class)
 public class EnumMapTest {
@@ -295,7 +293,6 @@ public class EnumMapTest {
 
     @Test
     @SuppressWarnings({ "unchecked", "rawtypes" })
-    @SkipPlatform({TestPlatform.WEBASSEMBLY, TestPlatform.WASI})
     public void putAll() {
         EnumMap enumColorMap = new EnumMap(Color.class);
         enumColorMap.put(Color.Green, 2);
diff --git a/tests/src/test/java/org/teavm/classlib/java/util/EnumSetTest.java b/tests/src/test/java/org/teavm/classlib/java/util/EnumSetTest.java
index 3166c38d9..8692eaa55 100644
--- a/tests/src/test/java/org/teavm/classlib/java/util/EnumSetTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/util/EnumSetTest.java
@@ -15,13 +15,22 @@
  */
 package org.teavm.classlib.java.util;
 
-import static org.junit.Assert.*;
-import java.util.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Set;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.teavm.junit.SkipPlatform;
 import org.teavm.junit.TeaVMTestRunner;
-import org.teavm.junit.TestPlatform;
 
 @RunWith(TeaVMTestRunner.class)
 public class EnumSetTest {
@@ -199,7 +208,6 @@ public class EnumSetTest {
     }
 
     @Test
-    @SkipPlatform({ TestPlatform.WEBASSEMBLY, TestPlatform.WASI })
     public void iterator() {
         Set<EnumFoo> set = EnumSet.noneOf(EnumFoo.class);
         set.add(EnumFoo.a);