diff --git a/roles/web_server/molecule/default/tests/test_client.py b/roles/web_server/molecule/default/tests/test_client.py
index 28260db64a016a346b35f1e9d9d9fd4bd06c1c52..0c91ec29f381f327bbd7d06d02b1c9cb5b98dad0 100644
--- a/roles/web_server/molecule/default/tests/test_client.py
+++ b/roles/web_server/molecule/default/tests/test_client.py
@@ -19,5 +19,5 @@ def test_connectivity(host):
             # HTTP, HTTPS.
             for port in [80, 443]:
 
-                ping = host.run('hping3 -S -p %d -c 1 %s' % (port, server))
+                ping = host.run('hping3 -S -p %s -c 1 %s', str(port), server)
                 assert ping.rc == 0