diff --git a/sshmd5.c b/sshmd5.c
index a9058be8..b4121aa5 100644
--- a/sshmd5.c
+++ b/sshmd5.c
@@ -311,7 +311,7 @@ void hmacmd5_do_hmac(struct hmacmd5_context *ctx,
 {
     ssh2_mac_start(&ctx->mac);
     put_data(&ctx->mac, blk, len);
-    return ssh2_mac_genresult(&ctx->mac, hmac);
+    ssh2_mac_genresult(&ctx->mac, hmac);
 }
 
 const struct ssh2_macalg ssh_hmac_md5 = {