diff --git a/gio/tests/gdbus-addresses.c b/gio/tests/gdbus-addresses.c
index 3cf87dec8..d6a5c2360 100644
--- a/gio/tests/gdbus-addresses.c
+++ b/gio/tests/gdbus-addresses.c
@@ -149,6 +149,7 @@ test_tcp_address (void)
   assert_not_supported_address ("tcp:host=localhost,port=-1");
   assert_not_supported_address ("tcp:host=localhost,port=420000");
   assert_not_supported_address ("tcp:host=localhost,port=42x");
+  assert_not_supported_address ("tcp:host=localhost,port=");
   assert_is_supported_address ("tcp:host=localhost,port=42,family=ipv4");
   assert_is_supported_address ("tcp:host=localhost,port=42,family=ipv6");
   assert_not_supported_address ("tcp:host=localhost,port=42,family=sopranos");