diff --git a/tests/ports.cfg b/tests/ports.cfg
index 7210c3c..5779348 100644
--- a/tests/ports.cfg
+++ b/tests/ports.cfg
@@ -14,6 +14,7 @@
 	 bind :::11003-11010
 	 bind :::+11011                      # port offset not permitted here in ':::+11011'
 	 bind :::-11012                      # port offset not permitted here in ':::-11012'
+	 bind udp@:11013                     # dgram-type socket not acceptable in 'udp@:11013'
 
 frontend f2
 	 bind :::0                           # invalid port '0'