diff --git a/lib/System/DynamicLibrary.cpp b/lib/System/DynamicLibrary.cpp
index eebd2b1f169..a21f16ab327 100644
--- a/lib/System/DynamicLibrary.cpp
+++ b/lib/System/DynamicLibrary.cpp
@@ -13,6 +13,7 @@
 
 #include "llvm/System/DynamicLibrary.h"
 #include "llvm/Config/config.h"
+#include <cstring>
 #include <map>
 
 // Collection of symbol name/value pairs to be searched prior to any libraries.
diff --git a/lib/System/Path.cpp b/lib/System/Path.cpp
index 144959755ef..6f0667fba50 100644
--- a/lib/System/Path.cpp
+++ b/lib/System/Path.cpp
@@ -14,6 +14,7 @@
 #include "llvm/System/Path.h"
 #include "llvm/Config/config.h"
 #include <cassert>
+#include <cstring>
 #include <ostream>
 using namespace llvm;
 using namespace sys;