diff --git a/flake.nix b/flake.nix
index 05a84e8..9140459 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,7 +16,7 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     colmena.url = "github:zhaofengli/colmena";
-    attic.url = github:zhaofengli/attic;
+    attic.url = "github:zhaofengli/attic";
 
     # we host our own
     simple-nixos-mailserver = {