diff --git a/pkgs/applications/networking/browsers/firefox/default.nix b/pkgs/applications/networking/browsers/firefox/default.nix
index 3b0eb140516..6a688de02d0 100644
--- a/pkgs/applications/networking/browsers/firefox/default.nix
+++ b/pkgs/applications/networking/browsers/firefox/default.nix
@@ -44,7 +44,7 @@ common = { pname, version, sha512, updateScript }: stdenv.mkDerivation rec {
     ++ lib.optional enableGTK3 gtk3
     ++ lib.optionals (!passthru.ffmpegSupport) [ gstreamer gst_plugins_base ];
 
-  nativeBuildInputs = [autoconf213 which];
+  nativeBuildInputs = [ autoconf213 which gnused ];
 
   configureFlags =
     [ "--enable-application=browser"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6827e1c164a..c2182870df9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -13216,6 +13216,7 @@ in
     libpng = libpng_apng;
     enableGTK3 = false;
     python = python2;
+    gnused = gnused_422;
   }) firefox-unwrapped firefox-esr-unwrapped;
 
   firefox = wrapFirefox firefox-unwrapped { };