diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/declaration/ClassTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/declaration/ClassTranslator.java
index c5ab497e195..d0e513971c6 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/declaration/ClassTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/declaration/ClassTranslator.java
@@ -160,7 +160,7 @@ public final class ClassTranslator extends AbstractTranslator {
         if (!isTrait()) {
             JsFunction initializer = Translation.generateClassInitializerMethod(classDeclaration, classDeclarationContext);
             if (context().isEcma5()) {
-                jsClassDeclaration.getArguments().add(isObject() ? initializer : JsAstUtils.encloseFunction(initializer));
+                jsClassDeclaration.getArguments().add(initializer.getName() == null ? initializer : JsAstUtils.encloseFunction(initializer));
             }
             else {
                 propertyList.add(InitializerUtils.generateInitializeMethod(initializer));