diff --git a/include/openssl/md4.h b/include/openssl/md4.h
index e363b73..19ed662 100644
--- a/include/openssl/md4.h
+++ b/include/openssl/md4.h
@@ -91,7 +91,7 @@
   uint32_t h[4];
   uint32_t Nl, Nh;
   uint32_t data[16];
-  unsigned int num;
+  unsigned num;
 };