diff --git a/java/java-impl/src/com/intellij/refactoring/move/moveClassesOrPackages/MoveClassToInnerProcessor.java b/java/java-impl/src/com/intellij/refactoring/move/moveClassesOrPackages/MoveClassToInnerProcessor.java
index 5fbfa3313d35..7aed2d8a03bc 100644
--- a/java/java-impl/src/com/intellij/refactoring/move/moveClassesOrPackages/MoveClassToInnerProcessor.java
+++ b/java/java-impl/src/com/intellij/refactoring/move/moveClassesOrPackages/MoveClassToInnerProcessor.java
@@ -144,7 +144,7 @@ public class MoveClassToInnerProcessor extends BaseRefactoringProcessor {
           newClass = handler.moveClass(classToMove, myTargetClass);
           if (newClass != null) break;
         }
-        LOG.assertTrue(newClass != null, "There is no appropriate MoveClassToInnerHandler!");
+        LOG.assertTrue(newClass != null, "There is no appropriate MoveClassToInnerHandler for " + myTargetClass + "; " + classToMove);
         oldToNewElementsMapping.put(classToMove, newClass);
       }