diff --git a/system/nixos/mastodon.nix b/system/nixos/mastodon.nix
index 5c8b695..88a461f 100644
--- a/system/nixos/mastodon.nix
+++ b/system/nixos/mastodon.nix
@@ -60,7 +60,7 @@ in
 
     extraConfig = {
       WEB_DOMAIN = web-domain;
-      LOCAL_HTTPS = true;
+      LOCAL_HTTPS = "true";
     };
   };