diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/FunctionCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/FunctionCodegen.java
index c8c9f3dee79..8ea5e7fd350 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/FunctionCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/FunctionCodegen.java
@@ -68,6 +68,10 @@ public class FunctionCodegen {
         {
             flags |= ACC_VARARGS;
         }
+        
+        if (functionDescriptor.getModality() == Modality.FINAL) {
+            flags |= ACC_FINAL;
+        }
 
         OwnerKind kind = context.getContextKind();
 
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
index 852b12ac22e..f1535c8f16a 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
@@ -47,19 +47,33 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
 
         boolean isAbstract = false;
         boolean isInterface = false;
+        boolean isFinal = false;
         if(myClass instanceof JetClass) {
-           if(((JetClass) myClass).hasModifier(JetTokens.ABSTRACT_KEYWORD))
+            JetClass jetClass = (JetClass) myClass;
+            if (jetClass.hasModifier(JetTokens.ABSTRACT_KEYWORD))
                isAbstract = true;
-            if(((JetClass) myClass).isTrait()) {
+            if (jetClass.isTrait()) {
                 isAbstract = true;
                 isInterface = true;
             }
+            if (!jetClass.hasModifier(JetTokens.OPEN_KEYWORD)) {
+                isFinal = true;
+            }
         }
 
+        int access = 0;
+        access |= Opcodes.ACC_PUBLIC;
+        if (isAbstract) {
+            access |= Opcodes.ACC_ABSTRACT;
+        }
+        if (isInterface) {
+            access |= Opcodes.ACC_INTERFACE; // ACC_SUPER
+        }
+        if (isFinal) {
+            access |= Opcodes.ACC_FINAL;
+        }
         v.defineClass(myClass, Opcodes.V1_6,
-                      Opcodes.ACC_PUBLIC | (isAbstract ? Opcodes.ACC_ABSTRACT : 0) | (isInterface
-                                                                                      ? Opcodes.ACC_INTERFACE
-                                                                                      : 0/*Opcodes.ACC_SUPER*/),
+                access,
                       signature.getName(),
                       signature.getJavaGenericSignature(),
                       signature.getSuperclassName(),
diff --git a/compiler/testData/readClass/fun/ModifierAbstract.kt b/compiler/testData/readClass/fun/ModifierAbstract.kt
new file mode 100644
index 00000000000..3800def1fad
--- /dev/null
+++ b/compiler/testData/readClass/fun/ModifierAbstract.kt
@@ -0,0 +1,5 @@
+namespace test
+
+abstract class ModifierAbstract {
+    abstract fun abs(): Int
+}
diff --git a/compiler/testData/readClass/fun/ModifierOpen.kt b/compiler/testData/readClass/fun/ModifierOpen.kt
new file mode 100644
index 00000000000..e9f15a08e07
--- /dev/null
+++ b/compiler/testData/readClass/fun/ModifierOpen.kt
@@ -0,0 +1,5 @@
+namespace test
+
+open class ModifierOpen {
+    open fun abs() = 1
+}
diff --git a/compiler/tests/org/jetbrains/jet/ReadClassDataTest.java b/compiler/tests/org/jetbrains/jet/ReadClassDataTest.java
index c653d33579d..e8fbc7679c6 100644
--- a/compiler/tests/org/jetbrains/jet/ReadClassDataTest.java
+++ b/compiler/tests/org/jetbrains/jet/ReadClassDataTest.java
@@ -146,6 +146,10 @@ public class ReadClassDataTest extends UsefulTestCase {
     private String serializeContent(ClassDescriptor klass) {
 
         StringBuilder sb = new StringBuilder();
+        
+        serialize(klass.getModality(), sb);
+        sb.append(" ");
+        
         serialize(klass.getKind(), sb);
         sb.append(" ");
         
@@ -221,6 +225,9 @@ public class ReadClassDataTest extends UsefulTestCase {
     
     
     private void serialize(FunctionDescriptor fun, StringBuilder sb) {
+        serialize(fun.getModality(), sb);
+        sb.append(" ");
+
         sb.append("fun ");
         if (!fun.getTypeParameters().isEmpty()) {
             sb.append("<");
@@ -278,7 +285,11 @@ public class ReadClassDataTest extends UsefulTestCase {
             sb.append(variance);
             sb.append(' ');
         }
-    } 
+    }
+    
+    private void serialize(Modality modality, StringBuilder sb) {
+        sb.append(modality.name().toLowerCase());
+    }
     
     private void serialize(JetType type, StringBuilder sb) {
         serialize(type.getConstructor().getDeclarationDescriptor(), sb);