diff --git a/pkgs/applications/networking/browsers/firefox/20.0.nix b/pkgs/applications/networking/browsers/firefox/20.0.nix
index 1480a300820..f672be59146 100644
--- a/pkgs/applications/networking/browsers/firefox/20.0.nix
+++ b/pkgs/applications/networking/browsers/firefox/20.0.nix
@@ -135,7 +135,6 @@ rec {
       [ "--enable-application=browser"
         "--with-libxul-sdk=${xulrunner}/lib/xulrunner-devel-${xulrunner.version}"
         "--enable-chrome-format=jar"
-        "--disable-elf-hack"
       ]
       ++ commonConfigureFlags
       ++ stdenv.lib.optional enableOfficialBranding "--enable-official-branding";
diff --git a/pkgs/applications/networking/browsers/firefox/21.0.nix b/pkgs/applications/networking/browsers/firefox/21.0.nix
index 02766a9ccff..d4bec94616d 100644
--- a/pkgs/applications/networking/browsers/firefox/21.0.nix
+++ b/pkgs/applications/networking/browsers/firefox/21.0.nix
@@ -135,7 +135,6 @@ rec {
       [ "--enable-application=browser"
         "--with-libxul-sdk=${xulrunner}/lib/xulrunner-devel-${xulrunner.version}"
         "--enable-chrome-format=jar"
-        "--disable-elf-hack"
       ]
       ++ commonConfigureFlags
       ++ stdenv.lib.optional enableOfficialBranding "--enable-official-branding";