1 files changed, 2 insertions, 1 deletions

diff --git a/src/testcurl/test_digestauth_concurrent.c b/src/testcurl/test_digestauth_concurrent.c
index 792d15de..e7789cbe 100644
--- a/src/testcurl/test_digestauth_concurrent.c
+++ b/src/testcurl/test_digestauth_concurrent.c
@@ -361,7 +361,8 @@ setupCURL (void *cbc, uint16_t port, char *errbuf)
     /* A workaround for some old libcurl versions, which ignore the specified
      * port by CURLOPT_PORT when digest authorisation is used. */
     res = snprintf (url, (sizeof(url) / sizeof(url[0])),
-                    "http://127.0.0.1:%d%s", (int) port, MHD_URI_BASE_PATH);
+                    "http://127.0.0.1:%u%s", (unsigned int) port,
+                    MHD_URI_BASE_PATH);
     if ((0 >= res) || ((sizeof(url) / sizeof(url[0])) <= (size_t) res))
       externalErrorExitDesc ("Cannot form request URL");
   }