diff --git a/dlls/bcrypt/gnutls.c b/dlls/bcrypt/gnutls.c
index 28a14e9b851..1c31b5625fc 100644
--- a/dlls/bcrypt/gnutls.c
+++ b/dlls/bcrypt/gnutls.c
@@ -1064,6 +1064,7 @@ NTSTATUS key_asymmetric_verify( struct key *key, void *padding, UCHAR *hash, ULO
         /* only the hash size must match, not the actual hash function */
         switch (hash_len)
         {
+        case 20: hash_alg = GNUTLS_DIG_SHA1; break;
         case 32: hash_alg = GNUTLS_DIG_SHA256; break;
         case 48: hash_alg = GNUTLS_DIG_SHA384; break;