diff --git a/pkgs/applications/networking/irc/chatzilla/default.nix b/pkgs/applications/networking/irc/chatzilla/default.nix
deleted file mode 100644
index 805b474e814f..000000000000
--- a/pkgs/applications/networking/irc/chatzilla/default.nix
+++ /dev/null
@@ -1,30 +0,0 @@
-{ stdenv, fetchurl, unzip, firefox-unwrapped, makeWrapper }:
-
-stdenv.mkDerivation rec {
-  name = "chatzilla-0.9.92";
-
-  src = fetchurl {
-    # Obtained from http://chatzilla.rdmsoft.com/xulrunner/.
-    url = "https://chatzilla.rdmsoft.com/xulrunner/download/${name}.en-US.xulapp";
-    sha256 = "09asg7ixjrin46xd19ri71g4jdrgb1gg0pk0lwk0dlb1qjxyf1xy";
-  };
-
-  buildInputs = [ unzip makeWrapper ];
-
-  buildCommand = ''
-    mkdir -p $out/libexec/chatzilla
-    unzip $src -d $out/libexec/chatzilla
-
-    makeWrapper ${firefox-unwrapped}/bin/firefox $out/bin/chatzilla \
-      --add-flags "-app $out/libexec/chatzilla/application.ini"
-
-    sed -i $out/libexec/chatzilla/application.ini -e 's/.*MaxVersion.*/MaxVersion=99.*/'
-  '';
-
-  meta = {
-    homepage = http://chatzilla.hacksrus.com/;
-    description = "Stand-alone version of Chatzilla, an IRC client";
-    maintainers = [ stdenv.lib.maintainers.eelco ];
-    platforms = stdenv.lib.platforms.linux;
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c4d999e8e9e8..9f5e509fbb03 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16750,8 +16750,6 @@ in
     amdappsdk = amdappsdk28;
   };
 
-  chatzilla = callPackage ../applications/networking/irc/chatzilla { };
-
   chirp = callPackage ../applications/radio/chirp {
     inherit (pythonPackages) pyserial pygtk;
   };