diff --git a/pkgs/tools/system/dool/default.nix b/pkgs/tools/system/dool/default.nix
index 4a958d6216062..b28b1cc66e1e1 100644
--- a/pkgs/tools/system/dool/default.nix
+++ b/pkgs/tools/system/dool/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   postPatch = ''
     substituteInPlace dool \
       --replace \
-        "os.path.abspath(os.path.dirname(sys.argv[0])) + '/plugins/'" \
+        "os.path.dirname(os.path.abspath(__file__)) + '/plugins/'" \
         "'$out/share/dool/'"
   '';