diff --git a/tools/bugpoint/OptimizerDriver.cpp b/tools/bugpoint/OptimizerDriver.cpp
index bac7f51de83..d1760596dbb 100644
--- a/tools/bugpoint/OptimizerDriver.cpp
+++ b/tools/bugpoint/OptimizerDriver.cpp
@@ -29,6 +29,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/System/Path.h"
 #include "llvm/System/Program.h"
+#include "llvm/Config/alloca.h"
 #include <fstream>
 using namespace llvm;