diff --git a/t-lack.asd b/t-lack.asd
index ae337e9..1c3cd71 100644
--- a/t-lack.asd
+++ b/t-lack.asd
@@ -13,6 +13,7 @@
   :license "LLGPL"
   :depends-on (:lack
                :clack
+               :clack-v1-compat
                :prove)
   :components ((:module "t"
                 :components