diff --git a/infra/common/nixos/default.nix b/infra/common/nixos/default.nix
index 9d9f994d..a45499b4 100644
--- a/infra/common/nixos/default.nix
+++ b/infra/common/nixos/default.nix
@@ -26,7 +26,7 @@ in
 
   nix.settings = {
     substituters = [
-      "https://attic.fediversity.net/demo"
+      "http://attic.fediversity.net/demo"
     ];
     trusted-public-keys = [
       "demo:N3CAZ049SeBVqBM+OnhLMrxWJ9altbD/aoJtHrY19KM="