diff --git a/idea/src/org/jetbrains/jet/plugin/libraries/JetSourceNavigationHelper.java b/idea/src/org/jetbrains/jet/plugin/libraries/JetSourceNavigationHelper.java
index 1168c71498c..8cec5ee2a16 100644
--- a/idea/src/org/jetbrains/jet/plugin/libraries/JetSourceNavigationHelper.java
+++ b/idea/src/org/jetbrains/jet/plugin/libraries/JetSourceNavigationHelper.java
@@ -229,10 +229,10 @@ public class JetSourceNavigationHelper {
 
     @Nullable
     private static JetClassOrObject getSourceForNamedClassOrObject(@NotNull JetClassOrObject decompiledClassOrObject) {
-        FqName classFqName = JetPsiUtil.getFQName((JetNamedDeclaration) decompiledClassOrObject);
+        FqName classFqName = JetPsiUtil.getFQName(decompiledClassOrObject);
         assert classFqName != null;
 
-        GlobalSearchScope librarySourcesScope = createLibrarySourcesScope((JetNamedDeclaration) decompiledClassOrObject);
+        GlobalSearchScope librarySourcesScope = createLibrarySourcesScope(decompiledClassOrObject);
         if (librarySourcesScope == GlobalSearchScope.EMPTY_SCOPE) { // .getProject() == null for EMPTY_SCOPE, and this breaks code
             return null;
         }