diff --git a/system-config/default.nix b/system-config/default.nix
index 5911b1b..ae2022e 100644
--- a/system-config/default.nix
+++ b/system-config/default.nix
@@ -49,7 +49,7 @@
                                     else if !(cfg.sysconfig ? remoteBuildClient) then false
                                     else cfg.sysconfig.remoteBuildClient;
                             in test)
-                            (builtins.readDir ./configuration)
+                            (builtins.attrNames (builtins.readDir ./configuration))
                         ).right
                     )
         ) else {}) // {