diff --git a/pkgs/by-name/si/signal-desktop/package.nix b/pkgs/by-name/si/signal-desktop/package.nix
index 10c160447c3e..3649ea08ca1f 100644
--- a/pkgs/by-name/si/signal-desktop/package.nix
+++ b/pkgs/by-name/si/signal-desktop/package.nix
@@ -14,6 +14,10 @@
   replaceVars,
   noto-fonts-color-emoji,
   nixosTests,
+
+  # command line arguments which are always set e.g "--password-store=kwallet6"
+  commandLineArgs ? "",
+
   withAppleEmojis ? false,
 }:
 let
@@ -203,7 +207,8 @@ stdenv.mkDerivation (finalAttrs: {
     makeWrapper '${lib.getExe electron}' "$out/bin/signal-desktop" \
       --add-flags "$out/share/signal-desktop/app.asar" \
       --set-default ELECTRON_FORCE_IS_PACKAGED 1 \
-      --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations --enable-wayland-ime=true}}"
+      --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations --enable-wayland-ime=true}}" \
+      --add-flags ${lib.escapeShellArg commandLineArgs}
 
     runHook postInstall
   '';