diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp
index 72f28aacd74..329632f8dcb 100644
--- a/lib/Transforms/Scalar/TailDuplication.cpp
+++ b/lib/Transforms/Scalar/TailDuplication.cpp
@@ -18,6 +18,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#define DEBUG_TYPE "tailduplicate"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Constant.h"
 #include "llvm/Function.h"