diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
index 9f1f5499721..a460f769bd1 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
@@ -301,6 +301,8 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> implem
         ClassContext objectContext = context.intoAnonymousClass(descriptor, this);
 
         new ImplementationBodyCodegen(declaration, objectContext, classBuilder, state, null).generate();
+        classBuilder.done();
+
         return StackValue.none();
     }