diff --git a/pkgs/by-name/vg/vgmstream/package.nix b/pkgs/by-name/vg/vgmstream/package.nix
index 6342295917e8..f1c3ef1a0447 100644
--- a/pkgs/by-name/vg/vgmstream/package.nix
+++ b/pkgs/by-name/vg/vgmstream/package.nix
@@ -21,45 +21,17 @@ assert lib.assertMsg (
   audaciousSupport -> stdenv.hostPlatform.isLinux
 ) "Only Linux supports building the Audacious plugin.";
 
-let
-  # https://github.com/vgmstream/vgmstream/blob/1b6a7915bf98ca14a71a0d44bef7a2c6a75c686d/cmake/dependencies/atrac9.cmake
-  atrac9-src = fetchFromGitHub {
-    owner = "Thealexbarney";
-    repo = "LibAtrac9";
-    rev = "6a9e00f6c7abd74d037fd210b6670d3cdb313049";
-    hash = "sha256-n47CzIbh8NxJ4GzKLjZQeS27k2lGx08trC1m4AOzVZc=";
-  };
-
-  # https://github.com/vgmstream/vgmstream/blob/1b6a7915bf98ca14a71a0d44bef7a2c6a75c686d/cmake/dependencies/celt.cmake
-  celt-0_6_1-src = fetchzip {
-    url = "https://downloads.xiph.org/releases/celt/celt-0.6.1.tar.gz";
-    hash = "sha256-DI1z10mTDQOn/R1FssaegmOa6ZNx3bXNiWHwLnytJWw=";
-  };
-  celt-0_11_0-src = fetchzip {
-    url = "https://downloads.xiph.org/releases/celt/celt-0.11.0.tar.gz";
-    hash = "sha256-JI3b44iCxQ29bqJGNH/L18pEuWiTFZ2132ceaqe8U0E=";
-  };
-in
-
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "vgmstream";
   version = "2055";
 
   src = fetchFromGitHub {
     owner = "vgmstream";
     repo = "vgmstream";
-    tag = "r${version}";
+    tag = "r${finalAttrs.version}";
     hash = "sha256-GNsoWCTLDd49T639lKkLoyBWpWYocDP6gZB2e8ZUyEU=";
   };
 
-  passthru.updateScript = nix-update-script {
-    attrPath = "vgmstream";
-    extraArgs = [
-      "--version-regex"
-      "r(.*)"
-    ];
-  };
-
   outputs = [ "out" ] ++ lib.optional audaciousSupport "audacious";
 
   nativeBuildInputs = [
@@ -86,21 +58,49 @@ stdenv.mkDerivation rec {
     # Therefore, CELT_0110_PATH needs to point to a mutable directory.
     lib.optionalString (stdenv.system == "x86_64-linux") ''
       mkdir -p dependencies/celt-0.11.0/
-      cp -r ${celt-0_11_0-src}/* dependencies/celt-0.11.0/
+      cp -r ${finalAttrs.passthru.sources.celt-0_11_0-src}/* dependencies/celt-0.11.0/
       chmod -R +w dependencies/celt-0.11.0/
     '';
 
   cmakeFlags = [
-    "-DATRAC9_PATH=${atrac9-src}"
+    "-DATRAC9_PATH=${finalAttrs.passthru.sources.atrac9-src}"
     (lib.cmakeBool "BUILD_AUDACIOUS" audaciousSupport)
   ]
   # Only supported on x86_64-linux
   ++ lib.optionals (stdenv.system == "x86_64-linux") [
-    "-DCELT_0061_PATH=${celt-0_6_1-src}"
+    "-DCELT_0061_PATH=${finalAttrs.passthru.sources.celt-0_6_1-src}"
     "-DCELT_0110_PATH=../dependencies/celt-0.11.0"
     # libg719_decode omitted because it doesn't have a free software license
   ];
 
+  passthru = {
+    updateScript = nix-update-script {
+      attrPath = "vgmstream";
+      extraArgs = [
+        "--version-regex"
+        "r(.*)"
+      ];
+    };
+    sources = {
+      # https://github.com/vgmstream/vgmstream/blob/1b6a7915bf98ca14a71a0d44bef7a2c6a75c686d/cmake/dependencies/atrac9.cmake
+      atrac9-src = fetchFromGitHub {
+        owner = "Thealexbarney";
+        repo = "LibAtrac9";
+        rev = "6a9e00f6c7abd74d037fd210b6670d3cdb313049";
+        hash = "sha256-n47CzIbh8NxJ4GzKLjZQeS27k2lGx08trC1m4AOzVZc=";
+      };
+      # https://github.com/vgmstream/vgmstream/blob/1b6a7915bf98ca14a71a0d44bef7a2c6a75c686d/cmake/dependencies/celt.cmake
+      celt-0_6_1-src = fetchzip {
+        url = "https://downloads.xiph.org/releases/celt/celt-0.6.1.tar.gz";
+        hash = "sha256-DI1z10mTDQOn/R1FssaegmOa6ZNx3bXNiWHwLnytJWw=";
+      };
+      celt-0_11_0-src = fetchzip {
+        url = "https://downloads.xiph.org/releases/celt/celt-0.11.0.tar.gz";
+        hash = "sha256-JI3b44iCxQ29bqJGNH/L18pEuWiTFZ2132ceaqe8U0E=";
+      };
+    };
+  };
+
   meta = with lib; {
     description = "Library for playback of various streamed audio formats used in video games";
     homepage = "https://vgmstream.org";
@@ -114,4 +114,4 @@ stdenv.mkDerivation rec {
       ++ optional (stdenv.system == "x86_64-linux") bsd2;
     platforms = with platforms; unix;
   };
-}
+})