diff --git a/include/llvm/System/Path.h b/include/llvm/System/Path.h
index 00e4ea3af01..22663491058 100644
--- a/include/llvm/System/Path.h
+++ b/include/llvm/System/Path.h
@@ -19,6 +19,7 @@
 #include <string>
 #include <vector>
 #include <iosfwd>
+#include <cstring>
 
 namespace llvm {
 namespace sys {