diff --git a/modules/wafrn.nix b/modules/wafrn.nix
index 3dcc75d..7193ef1 100644
--- a/modules/wafrn.nix
+++ b/modules/wafrn.nix
@@ -14,18 +14,11 @@ let
 
   defaultWafrnPackage =
     if wafrnSrc != null then
-      pkgs.stdenvNoCC.mkDerivation {
-        pname = "wafrn-source";
-        version = "unstable";
-        src = wafrnSrc;
-        dontConfigure = true;
-        dontBuild = true;
-        installPhase = ''
-          mkdir -p "$out"
-          cp -a ./. "$out/"
-          chmod -R u+w "$out"
-        '';
-      }
+      pkgs.runCommand "wafrn-source-unstable" { } ''
+        mkdir -p "$out"
+        cp -a ${wafrnSrc}/. "$out/"
+        chmod -R u+w "$out"
+      ''
     else
       null;