--- md5.c
+++ md5.c
@@ -27,12 +27,9 @@
 #ifdef USE_MD5
 
 #include <stdlib.h>
-#ifdef HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif
-
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
 #include "md5.h"
 
 #ifdef _LIBC