diff --git a/enviroments/common/default.nix b/enviroments/common/default.nix
index 3dd24c1..9ee0c50 100644
--- a/enviroments/common/default.nix
+++ b/enviroments/common/default.nix
@@ -15,7 +15,7 @@
     };
     optimise = {
       automatic = true;
-      dates = "weekly";
+      dates = ["weekly"];
     };
   };