diff --git a/java/testFramework/src/com/intellij/codeInsight/completion/CompletionAutoPopupTestCase.groovy b/java/testFramework/src/com/intellij/codeInsight/completion/CompletionAutoPopupTestCase.groovy
index 42b0ce7f8a65..7ddc6eb88ff5 100644
--- a/java/testFramework/src/com/intellij/codeInsight/completion/CompletionAutoPopupTestCase.groovy
+++ b/java/testFramework/src/com/intellij/codeInsight/completion/CompletionAutoPopupTestCase.groovy
@@ -65,6 +65,7 @@ abstract class CompletionAutoPopupTestCase extends LightCodeInsightFixtureTestCa
       }
       Thread.sleep(10)
     }
+    printThreadDump()
     fail("Too long completion")
   }