diff --git a/pkgs/data/fonts/joypixels/default.nix b/pkgs/data/fonts/joypixels/default.nix
index 3806da6c9f39..fabffe88d91a 100644
--- a/pkgs/data/fonts/joypixels/default.nix
+++ b/pkgs/data/fonts/joypixels/default.nix
@@ -1,42 +1,55 @@
 { stdenv, fetchurl }:
 
+let inherit (stdenv.hostPlatform) system;
+
+    throwSystem = throw "Unsupported system: ${system}";
+
+    systemTag = {
+      x86_64-darwin = "nix-darwin";
+      x86_64-linux = "nix-os";
+    }.${system} or throwSystem;
+
+    capitalized = {
+      x86_64-darwin = systemTag;
+      x86_64-linux = "NixOS";
+    }.${system} or throwSystem;
+
+    fontFile = {
+      x86_64-darwin = "Apple%20Color%20Emoji.ttc";
+      x86_64-linux = "joypixels-android.ttf";
+    }.${system} or throwSystem;
+
+    name = {
+      x86_64-darwin = "joypixels-apple-color-emoji.ttc";
+      x86_64-linux = fontFile;
+    }.${system} or throwSystem;
+
+    ext = {
+      x86_64-darwin = "ttc";
+      x86_64-linux = "ttf";
+    }.${system} or throwSystem;
+
+    sha256 = {
+      x86_64-darwin = "043980g0dlp8vd4qkbx6298fwz8ns0iwbxm0f8czd9s7n2xm4npq";
+      x86_64-linux = "1vxqsqs93g4jyp01r47lrpcm0fmib2n1vysx32ksmfxmprimb75s";
+    }.${system} or throwSystem;
+
+in
+
 stdenv.mkDerivation rec {
-  inherit (stdenv.hostPlatform) system;
-
-  throwSystem = throw "Unsupported system: ${system}";
-
   pname = "joypixels";
   version = "6.0.0";
 
-  url = {
-    x86_64-darwin = "https://cdn.joypixels.com/distributions/nix-darwin/font/6.0.0/Apple%20Color%20Emoji.ttc";
-    x86_64-linux = "https://cdn.joypixels.com/distributions/nix-os/font/${version}/joypixels-android.ttf";
-  }.${system} or throwSystem;
-
-  name = {
-    x86_64-darwin = "joypixels-apple-color-emoji.ttc";
-    x86_64-linux = "joypixels-android.ttf";
-  }.${system} or throwSystem;
-
-  sha256 = {
-    x86_64-darwin = "043980g0dlp8vd4qkbx6298fwz8ns0iwbxm0f8czd9s7n2xm4npq";
-    x86_64-linux = "1vxqsqs93g4jyp01r47lrpcm0fmib2n1vysx32ksmfxmprimb75s";
-  }.${system} or throwSystem;
-
   src = fetchurl {
-    inherit url name sha256;
+    inherit name sha256;
+    url = "https://cdn.joypixels.com/distributions/${systemTag}/font/${version}/${fontFile}";
   };
 
   dontUnpack = true;
 
-  installPhase = {
-    x86_64-darwin = ''
-      install -Dm644 $src $out/share/fonts/truetype/joypixels.ttc
-    '';
-    x86_64-linux = ''
-      install -Dm644 $src $out/share/fonts/truetype/joypixels.ttf
-    '';
-  }.${system} or throwSystem;
+  installPhase = ''
+    install -Dm644 $src $out/share/fonts/truetype/joypixels.${ext}
+  '';
 
   meta = with stdenv.lib; {
     description = "Emoji as a Service (formerly EmojiOne)";