diff --git a/module/RemoteBuilder.nix b/module/RemoteBuilder.nix
index 715d6ac8..567becb8 100644
--- a/module/RemoteBuilder.nix
+++ b/module/RemoteBuilder.nix
@@ -1,6 +1,6 @@
 { ... }: {
 	# To apply: nix store sign --all -k /path/to/secret-key-file
 	nix.extraOptions = ''
-		extra-secret-key-files = /root/.nixcache/secret-key-file
+		secret-key-files = /root/.nixcache/secret-key-file
 	'';
 }