diff --git a/lib/Transforms/Scalar/LoopUnroll.cpp b/lib/Transforms/Scalar/LoopUnroll.cpp
index ad8cfd4eeb2..aa1c7e73636 100644
--- a/lib/Transforms/Scalar/LoopUnroll.cpp
+++ b/lib/Transforms/Scalar/LoopUnroll.cpp
@@ -12,6 +12,7 @@
 // counts of loops easily.
 //===----------------------------------------------------------------------===//
 
+#include <climits>
 #define DEBUG_TYPE "loop-unroll"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/Transforms/Scalar.h"