diff --git a/pkgs/applications/misc/moolticute/default.nix b/pkgs/applications/misc/moolticute/default.nix
index 11f6e7bbc048..7097f584f54a 100644
--- a/pkgs/applications/misc/moolticute/default.nix
+++ b/pkgs/applications/misc/moolticute/default.nix
@@ -28,14 +28,14 @@ mkDerivation rec {
 
   preInstall = ''
     mkdir -p $udev/lib/udev/rules.d
-    sed -n '/^ \+cat > "$tmpfile" <<- EOF$/,/^EOF$/p' ../data/moolticute.sh |
+    sed -n '/^UDEV_RULE=="\$(cat <<-EOF$/,/^EOF$/p' ../data/moolticute.sh |
         sed '1d;$d' > $udev/lib/udev/rules.d/50-mooltipass.rules
  '';
 
   meta = with lib; {
     description = "GUI app and daemon to work with Mooltipass device via USB";
     longDescription = ''
-      To install udev rules, add `services.udev.packages == [ moolticute.udev ]`
+      To install udev rules, add `services.udev.packages = [ pkgs.moolticute.udev ]`
       into `nixos/configuration.nix`.
     '';
     homepage = "https://github.com/mooltipass/moolticute";