diff --git a/include/openssl/md5.h b/include/openssl/md5.h
index 87c3ba4..055cdb0 100644
--- a/include/openssl/md5.h
+++ b/include/openssl/md5.h
@@ -96,7 +96,7 @@
   uint32_t h[4];
   uint32_t Nl, Nh;
   uint32_t data[16];
-  unsigned int num;
+  unsigned num;
 };