diff --git a/modules/btop/module.nix b/modules/btop/module.nix
index 98740df..2417ed7 100644
--- a/modules/btop/module.nix
+++ b/modules/btop/module.nix
@@ -17,7 +17,7 @@
   };
 
   config.flags = {
-    "--config" = toString config."btop.conf".path;
+    "--config" = "${config."btop.conf".path}";
   };
 
   config.package = config.pkgs.btop;