diff --git a/hosts/c3d2-web/default.nix b/hosts/c3d2-web/default.nix
index db2587ed..2779ea64 100644
--- a/hosts/c3d2-web/default.nix
+++ b/hosts/c3d2-web/default.nix
@@ -9,7 +9,7 @@ in
   };
   c3d2.deployment = {
     # /tmp is to small for drone to clone the repo even with depth
-    mounts = lib.mkOptionDefault ++ [ "tmp" ];
+    mounts = lib.mkOptionDefault [ "tmp" ];
     server = "server10";
   };