diff --git a/tests/data/test506 b/tests/data/test506
index c3cfec65a8..35746bb6e2 100644
--- a/tests/data/test506
+++ b/tests/data/test506
@@ -55,10 +55,11 @@ run 3: overwrite cookie 1 and 4, set cookie 6 with and without tailmatch
 <server>
 http
 </server>
-# don't run this with the threaded-resolver since the events might trigger in
-# a different order!
+# don't run this with the threaded-resolver or c-ares since the events might
+# trigger in a different order!
 <features>
 !threaded-resolver
+!c-ares
 </features>
 <name>
 HTTP with shared cookie list (and dns cache)