diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WritableScopeWithImports.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WritableScopeWithImports.java
index 8db7872b9fe..6c8547853a9 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WritableScopeWithImports.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WritableScopeWithImports.java
@@ -96,6 +96,10 @@ public abstract class WritableScopeWithImports extends JetScopeAdapter implement
 
     @Override
     public void importScope(@NotNull JetScope imported) {
+        if (imported == this) {
+            throw new IllegalStateException("cannot import scope into self");
+        }
+
         checkMayWrite();
 
         getImports().add(0, imported);