diff --git a/include/llvm/Analysis/InlineCost.h b/include/llvm/Analysis/InlineCost.h
index ea913bd5e66..066b9439689 100644
--- a/include/llvm/Analysis/InlineCost.h
+++ b/include/llvm/Analysis/InlineCost.h
@@ -16,6 +16,7 @@
 
 #include <cassert>
 #include <climits>
+#include <map>
 #include <vector>
 #include "llvm/ADT/DenseMap.h"