diff --git a/tests/unit/unit1658.c b/tests/unit/unit1658.c
index fa281fe3ea..41cfb48d79 100644
--- a/tests/unit/unit1658.c
+++ b/tests/unit/unit1658.c
@@ -46,7 +46,7 @@ static void rrresults(struct Curl_https_rrinfo *rr, CURLcode res)
 {
   char *p = rrbuffer;
   const char *pend = rrbuffer + sizeof(rrbuffer);
-  curl_msnprintf(rrbuffer, sizeof(rrbuffer), "r:%d|", (int)res);
+  curl_msnprintf(rrbuffer, sizeof(rrbuffer), "r:%d|", res);
   p += strlen(rrbuffer);
 
   if(rr) {