diff --git a/tools/bugpoint/ExtractFunction.cpp b/tools/bugpoint/ExtractFunction.cpp
index 6d94f7aec4e..bb35d4fab45 100644
--- a/tools/bugpoint/ExtractFunction.cpp
+++ b/tools/bugpoint/ExtractFunction.cpp
@@ -20,6 +20,7 @@
 #include "llvm/PassManager.h"
 #include "llvm/Pass.h"
 #include "llvm/Analysis/Verifier.h"
+#include "llvm/Assembly/Writer.h"
 #include "llvm/Transforms/IPO.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/Cloning.h"