diff --git a/clang/include/clang/Driver/ArgList.h b/clang/include/clang/Driver/ArgList.h
index a9c890b0b899418006b7153e6c8120b7f9c4e975..ea8846a6e9f056e5d95d4bae06a8051d97be0ec7 100644
--- a/clang/include/clang/Driver/ArgList.h
+++ b/clang/include/clang/Driver/ArgList.h
@@ -16,6 +16,7 @@
 #include "llvm/ADT/SmallVector.h"
 
 #include <list>
+#include <string>
 
 namespace clang {
 namespace driver {