diff --git a/pkgs/build-support/fetchfirefoxaddon/default.nix b/pkgs/build-support/fetchfirefoxaddon/default.nix
index 41eaa550ea27..e07a6a1a79dd 100644
--- a/pkgs/build-support/fetchfirefoxaddon/default.nix
+++ b/pkgs/build-support/fetchfirefoxaddon/default.nix
@@ -9,7 +9,6 @@
 
 { name
 , url ? null
-, md5 ? ""
 , sha1 ? ""
 , sha256 ? ""
 , sha512 ? ""
@@ -23,7 +22,7 @@ let
   source = if url == null then src else
   fetchurl {
     url = url;
-    inherit md5 sha1 sha256 sha512 hash;
+    inherit sha1 sha256 sha512 hash;
   };
 in
 stdenv.mkDerivation {