diff --git a/compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/PsiClassFinderForJvm.java b/compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/PsiClassFinderForJvm.java
index 07040b7be22..93d038f2f64 100644
--- a/compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/PsiClassFinderForJvm.java
+++ b/compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/PsiClassFinderForJvm.java
@@ -87,7 +87,7 @@ public class PsiClassFinderForJvm implements PsiClassFinder {
         if (result != null) {
             FqName actualQualifiedName = new FqName(result.getQualifiedName());
             if (!actualQualifiedName.equals(qualifiedName)) {
-//                throw new IllegalStateException("requested " + qualifiedName + ", got " + actualQualifiedName);
+                throw new IllegalStateException("requested " + qualifiedName + ", got " + actualQualifiedName);
             }
         }