diff --git a/flake.nix b/flake.nix
index f435515..245cc18 100644
--- a/flake.nix
+++ b/flake.nix
@@ -30,8 +30,8 @@
   };
 
   nixConfig = {
-    extra-substituters = [ "https://emacs-ci.cachix.org" ];
-    extra-trusted-public-keys = [ "emacs-ci.cachix.org-1:B5FVOrxhXXrOL0S+tQ7USrhjMT5iOPH+QN9q0NItom4=" ];
+    extra-substituters = "https://emacs-ci.cachix.org";
+    extra-trusted-public-keys = "emacs-ci.cachix.org-1:B5FVOrxhXXrOL0S+tQ7USrhjMT5iOPH+QN9q0NItom4=";
   };
 
   outputs = { self, nixpkgs, flake-utils, ... }@inputs: {