diff --git a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
index 63196a62a837..cf243d21e7b9 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
@@ -536,7 +536,7 @@ public class LookupImpl extends LightweightHint implements LookupEx, Disposable,
       public void perform(Caret caret) {
         EditorModificationUtil.deleteSelectedText(hostEditor);
         final int caretOffset = hostEditor.getCaretModel().getOffset();
-        int lookupStart = Math.max(caretOffset - prefix, 0);
+        int lookupStart = Math.max(Math.max(caretOffset - prefix, 0), caretOffset);
 
         int len = hostEditor.getDocument().getTextLength();
         LOG.assertTrue(lookupStart >= 0 && lookupStart <= len,