diff --git a/module/RemoteBuilder.nix b/module/RemoteBuilder.nix
index 1866ce21..8cfb3f34 100644
--- a/module/RemoteBuilder.nix
+++ b/module/RemoteBuilder.nix
@@ -2,5 +2,6 @@
 	# To apply: nix sign-paths --all -k /path/to/secret-key-file
 	nix.extraOptions = ''
 		extra-secret-key-files = /root/.nixcache/secret-key-file
+		builders-use-substitutes = true
 	'';
 }