diff --git a/pkgs/desktops/cinnamon/nemo/default.nix b/pkgs/desktops/cinnamon/nemo/default.nix
index 7b124c7987da..fe61e9701d9c 100644
--- a/pkgs/desktops/cinnamon/nemo/default.nix
+++ b/pkgs/desktops/cinnamon/nemo/default.nix
@@ -67,6 +67,13 @@ stdenv.mkDerivation rec {
     "--localedir=${cinnamon-translations}/share/locale"
   ];
 
+  postInstall = ''
+    # This fixes open as root and handles nemo-with-extensions well.
+    # https://github.com/NixOS/nixpkgs/issues/297570
+    substituteInPlace $out/share/polkit-1/actions/org.nemo.root.policy \
+      --replace-fail "$out/bin/nemo" "/run/current-system/sw/bin/nemo"
+  '';
+
   preFixup = ''
     # Used for some non-fd.o icons (e.g. xapp-text-case-symbolic)
     gappsWrapperArgs+=(