diff --git a/llvm/lib/Support/CommandLine.cpp b/llvm/lib/Support/CommandLine.cpp
index 804af95..c70ed0d 100644
--- a/llvm/lib/Support/CommandLine.cpp
+++ b/llvm/lib/Support/CommandLine.cpp
@@ -29,6 +29,7 @@
 #include <cstdlib>
 #include <cerrno>
 #include <cstring>
+#include <climits>
 using namespace llvm;
 using namespace cl;