diff --git a/mastodon-container.nix b/mastodon-container.nix
index 21666f5..5805879 100644
--- a/mastodon-container.nix
+++ b/mastodon-container.nix
@@ -132,7 +132,7 @@ in {
                     automaticMigrations = true;
                     streamingProcesses = cfg.streaming-processes;
                     extraConfig.registrations_open =
-                      if cfg.allow_registrations then "true" else "false";
+                      if cfg.allow-registrations then "true" else "false";
                   };
                   nginx = {
                     recommendedTlsSettings = true;