diff --git a/module/backend.nix b/module/backend.nix
index 47f83f7..2af764d 100644
--- a/module/backend.nix
+++ b/module/backend.nix
@@ -7,7 +7,7 @@
   inherit (lib.modules) mkIf;
   inherit (lib.trivial) boolToString;
   inherit (lib.attrsets) mapAttrsToList optionalAttrs;
-  inherit (lib.strings) coptionalString oncatStringsSep;
+  inherit (lib.strings) coptionalString concatStringsSep;
   inherit (pkgs) writeText writeShellScript;
 
   cfg = config.services.piped;