diff --git a/nixos/modules/programs/slock.nix b/nixos/modules/programs/slock.nix
index ce80fcc5d4a8..f39b4d5e9280 100644
--- a/nixos/modules/programs/slock.nix
+++ b/nixos/modules/programs/slock.nix
@@ -16,16 +16,17 @@ in
           Whether to install slock screen locker with setuid wrapper.
         '';
       };
+      package = mkPackageOption pkgs "slock" {};
     };
   };
 
   config = mkIf cfg.enable {
-    environment.systemPackages = [ pkgs.slock ];
+    environment.systemPackages = [ cfg.package ];
     security.wrappers.slock =
       { setuid = true;
         owner = "root";
         group = "root";
-        source = "${pkgs.slock.out}/bin/slock";
+        source = lib.getExe cfg.package;
       };
   };
 }