diff --git a/crypto/external/bsd/openssl/dist/crypto/md4/md4_dgst.c b/crypto/external/bsd/openssl/dist/crypto/md4/md4_dgst.c
index b0120118b2fc..29b6b252bae3 100644
--- a/crypto/external/bsd/openssl/dist/crypto/md4/md4_dgst.c
+++ b/crypto/external/bsd/openssl/dist/crypto/md4/md4_dgst.c
@@ -37,7 +37,7 @@ int MD4_Init(MD4_CTX *c)
 void md4_block_data_order(MD4_CTX *c, const void *data_, size_t num)
 {
     const unsigned char *data = data_;
-    register MD32_REG_T A, B, C, D, l;
+    register unsigned MD32_REG_T A, B, C, D, l;
 # ifndef MD32_XARRAY
     /* See comment in crypto/sha/sha_local.h for details. */
     unsigned MD32_REG_T XX0, XX1, XX2, XX3, XX4, XX5, XX6, XX7,