diff --git a/hash_intmd5.c b/hash_intmd5.c
index 0b60f9b..49da1cf 100644
--- a/hash_intmd5.c
+++ b/hash_intmd5.c
@@ -29,6 +29,7 @@
 #include "sysincl.h"
 #include "hash.h"
 #include "memory.h"
+#include "util.h"
 
 #include "md5.c"