diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index 535f1064ad48..b18098ad7fe5 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -386,7 +386,6 @@ with (import ./release-lib.nix);
   };
 
   firefox36Pkgs.firefox = linux;
-  firefox40Pkgs.firefox = linux;
   firefox50Pkgs.firefox = linux;
 
   gnome = {