diff --git a/lib/md5.c b/lib/md5.c
index d7da941f13..99d9e05d70 100644
--- a/lib/md5.c
+++ b/lib/md5.c
@@ -53,7 +53,7 @@ documentation and/or software.
 #include <string.h>
 
 /* UINT4 defines a four byte word */
-typedef unsigned long int UINT4;
+typedef unsigned int UINT4;
 
 /* MD5 context. */
 struct md5_ctx {