diff --git a/tests/data/test506 b/tests/data/test506
index 96e690b2f9..40eee25321 100644
--- a/tests/data/test506
+++ b/tests/data/test506
@@ -55,6 +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!
+<features>
+!threaded-resolver
+</features>
 <name>
 HTTP with shared cookie list (and dns cache)
 </name>