diff --git a/flake.nix b/flake.nix
index 50120fa..852cf06 100644
--- a/flake.nix
+++ b/flake.nix
@@ -57,7 +57,7 @@
           "sourcemod-include-steamworks"
           "srcds-tf2"
           "sourcemod-addon-curl"
-          "sourcemod-plugin-steamworks"
+          "sourcemod-addon-steamworks"
           "sourcemod-plugin-soap-tf2dm"
           "sourcemod-plugin-progressive-ruleset-timer"
           "sourcemod-plugin-socket"
@@ -82,6 +82,7 @@
               sourcemod = true;
               plugins = with pkgs; [
                 sourcemod-addon-curl
+                sourcemod-addon-steamworks
                 sourcemod-plugin-mapdownloader
                 sourcemod-plugin-whitelist
                 sourcemod-plugin-nocheats
diff --git a/nix/sourcemod/hl2sdks.json b/nix/sourcemod/hl2sdks.json
index 13673d6..6692b8c 100644
--- a/nix/sourcemod/hl2sdks.json
+++ b/nix/sourcemod/hl2sdks.json
@@ -105,7 +105,7 @@
   "sdk2013": {
     "rev": "4c56ee5bc8bfe00793abb7d40eb3f6fb040f10d2",
     "sha256": "sha256-aWrQt7XIpXiomDICcSSqyxYsRZgpHnwX7eIX4o2V5jE=",
-    "platforms": ["i686-linux"]
+    "platforms": ["i686-linux", "x86_64-linux"]
   },
   "hl2dm": {
     "rev": "af883d5052349f09fbe641c99149b84769a62d01",
diff --git a/nix/sourcemod/plugins/overlay.nix b/nix/sourcemod/plugins/overlay.nix
index 90acd3d..2b96314 100644
--- a/nix/sourcemod/plugins/overlay.nix
+++ b/nix/sourcemod/plugins/overlay.nix
@@ -1,7 +1,7 @@
 final: prev: {
   mkSpirePlugin = final.callPackage ./builder/spire-plugin.nix {};
   sourcemod-addon-curl = final.callPackage ./curl.nix {};
-  sourcemod-plugin-steamworks = final.callPackage ./steamworks.nix {};
+  sourcemod-addon-steamworks = final.callPackage ./steamworks.nix {};
   sourcemod-plugin-soap-tf2dm = final.callPackage ./soap-tf2dm.nix {};
   sourcemod-plugin-progressive-ruleset-timer = final.callPackage ./progressive-ruleset-timer.nix {};
   sourcemod-plugin-socket = final.callPackage ./socket.nix {};
diff --git a/nix/sourcemod/plugins/steamworks.nix b/nix/sourcemod/plugins/steamworks.nix
index 122a13b..feeb0ac 100644
--- a/nix/sourcemod/plugins/steamworks.nix
+++ b/nix/sourcemod/plugins/steamworks.nix
@@ -1,31 +1,49 @@
 {
-  fetchurl,
-  stdenvNoCC,
-  nix-update-script,
-}:
-stdenvNoCC.mkDerivation (finalAttrs: {
-  pname = "sourcemod-plugin-steamworks";
-  version = "1.2.3c";
-  src = fetchurl {
-    url = "https://github.com/KyleSanderson/SteamWorks/releases/download/${finalAttrs.version}/package-lin.tgz";
-    sha256 = "sha256-Znnm39GdTHinHSJP8/fXLZvsvCVggu1LzoXLqh4BJxM=";
+  fetchFromGitHub,
+  stdenv,
+  writeScript,
+  ambuild,
+  hl2sdk,
+  sourcemod,
+  metamod-source,
+}: let
+  steamworks-sdk = fetchFromGitHub {
+    owner = "rlabrecque";
+    repo = "SteamworksSDK";
+    rev = "be6107f4b75bf996531415c53a6488a33a2a1be3";
+    hash = "sha256-7+s2BKyNMCyiMRoj46DWDWGWZM+melUfuoMzvKDuYUo=";
   };
-
-  installPhase = ''
-    runHook preInstall
-
-    mkdir $out
-    mv addons $out/
-
-    runHook postInstall
-  '';
-
-  passthru = {
-    updateScript = nix-update-script {
-      extraArgs = [
-        "--flake"
-        "--version=1.2.3c" # https://github.com/Mic92/nix-update/issues/435
-      ];
+in
+  stdenv.mkDerivation (finalAttrs: {
+    pname = "sourcemod-addon-steamworks";
+    version = "1.2.3c-64bit-compat";
+    src = fetchFromGitHub {
+      owner = "moonexpr";
+      repo = "SteamWorks";
+      tag = "x86_64-support";
+      hash = "sha256-SvyXsVL+JuJmxO0ox5fyAlmt9Ir52U/uCJ8HbUNA5Oc=";
     };
-  };
-})
+
+    nativeBuildInputs = [ambuild];
+
+    NIX_CFLAGS_COMPILE = "-Wno-error=format-security";
+
+    installPhase = ''
+      runHook preInstall
+
+      mkdir build
+      cd build
+      cp ../AMBuildScript ../../
+      python ../configure.py -s tf2 --hl2sdk-root ${hl2sdk.tf2} --sm-path ${sourcemod.src} --mms-path ${metamod-source.src} --steamworks-path ${steamworks-sdk}
+      ambuild
+
+      cp -r package $out
+
+      runHook postInstall
+    '';
+
+    passthru = {
+      # https://github.com/KyleSanderson/SteamWorks/pull/39 needs to be merged before we can auto-update
+      updateScript = writeScript "update-null" "";
+    };
+  })