diff --git a/source/md5/md5.cpp b/source/md5/md5.cpp
index e1012d268..eae0fc3f2 100644
--- a/source/md5/md5.cpp
+++ b/source/md5/md5.cpp
@@ -33,6 +33,13 @@ documentation and/or software.
 /* interface header */
 #include "md5.h"
 
+/* system implementation headers */
+#include <stdio.h>
+
+#ifndef _WIN32
+	#include <cstring>
+#endif
+