diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
index 494742a8192..4121669fc55 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
@@ -56,7 +56,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                 isAbstract = true;
                 isInterface = true;
             }
-            if (!jetClass.hasModifier(JetTokens.OPEN_KEYWORD)) {
+            if (!jetClass.hasModifier(JetTokens.OPEN_KEYWORD) && !isAbstract) {
                 isFinal = true;
             }
         }