diff --git a/firefox.spec b/firefox.spec
index e594fa6cbc5aae057428cb7933219530a3a83d81..e3873421834349c25015b413f84df0af9691ba44 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -161,11 +161,6 @@ Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
 Source10:       firefox-mozconfig
 Source12:       firefox-anolis-default-prefs.js
-%if 0%{?centos}
-Source12:       firefox-centos-default-prefs.js
-%else
-Source12:       firefox-redhat-default-prefs.js
-%endif
 Source20:       firefox.desktop
 Source21:       firefox.sh.in
 Source23:       firefox.1