diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index 51309eb..fa47003 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -81,10 +81,9 @@
       desktopName = "Firefox ESR";
       icon = "firefox";
       wmClass = "firefox-esr";
-      meta = prev.firefox-esr.meta // {
-        mainProgram = "firefox-esr";
-      };
     };
   in
-    wrappedFirefox;
+    wrappedFirefox // {
+      meta = prev.firefox-esr.meta;
+    };
 }