diff --git a/lib/Target/PIC16/PIC16.h b/lib/Target/PIC16/PIC16.h
index b25b0cc2c18..1f4aa9680db 100644
--- a/lib/Target/PIC16/PIC16.h
+++ b/lib/Target/PIC16/PIC16.h
@@ -18,6 +18,7 @@
 #include "llvm/Target/TargetMachine.h"
 #include <iosfwd>
 #include <cassert>
+#include <cstring>
 #include <string>
 
 namespace llvm {