diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d0c6cb7ecd6..a8061f8c19e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -365,7 +365,7 @@ in
 
   fetchhg = callPackage ../build-support/fetchhg { };
 
-  fetchfirefoxaddon = callPackage ../build-support/fetchfirefoxaddon {};
+  fetchFirefoxAddon = callPackage ../build-support/fetchfirefoxaddon {};
 
   # `fetchurl' downloads a file from the network.
   fetchurl = if stdenv.buildPlatform != stdenv.hostPlatform