diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/OverloadResolver.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/OverloadResolver.java
index 435f4ba1a90..bbbaad687bc 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/OverloadResolver.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/OverloadResolver.java
@@ -78,7 +78,7 @@ public class OverloadResolver {
                 inPackages.put(getFqName(klass), klass.getConstructors());
             }
             else if (!(containingDeclaration instanceof FunctionDescriptor)) {
-                throw new IllegalStateException();
+                throw new IllegalStateException("Illegal class container: " + containingDeclaration);
             }
         }
     }