diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index ec767a3..fd001d0 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
           name: link
           instance: https://cache.icewind.link
           authToken: "${{ secrets.ATTIC_TOKEN }}"
-      - run: nix flake check --keep-going
+      - run: nix flake check --keep-going --option system i686-linux
 
   sourcemod:
     runs-on: nix
diff --git a/flake.nix b/flake.nix
index b317020..ce4e3f7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -54,6 +54,7 @@
           "sourcemod-include-curl"
           "sourcemod-include-library"
           "sourcemod-include-steamworks"
+          "sourcemod-include-json"
           "srcds-tf2"
           "srctvplus"
           "sourcemod-addon-curl"
diff --git a/nix/sourcemod/includes/json.nix b/nix/sourcemod/includes/json.nix
new file mode 100644
index 0000000..be46222
--- /dev/null
+++ b/nix/sourcemod/includes/json.nix
@@ -0,0 +1,33 @@
+{
+  stdenv,
+  fetchFromGitHub,
+  nix-update-script,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "sourcemod-include-json";
+  version = "5.0.1";
+
+  src = fetchFromGitHub {
+    owner = "clugg";
+    repo = "sm-json";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-XkqLDBd0o/DMKDs3Z8JPUVBfEmuM45jxa58flGy6+08=";
+  };
+
+  doConfigure = false;
+  doBuild = false;
+
+  installPhase = ''
+    mkdir $out
+    cp -r addons/sourcemod/scripting/include $out
+  '';
+
+  passthru = {
+    updateScript = nix-update-script {
+      extraArgs = [
+        "--flake"
+        "--version=branch"
+      ];
+    };
+  };
+})
diff --git a/nix/sourcemod/includes/overlay.nix b/nix/sourcemod/includes/overlay.nix
index 6988e16..4ed3395 100644
--- a/nix/sourcemod/includes/overlay.nix
+++ b/nix/sourcemod/includes/overlay.nix
@@ -3,4 +3,5 @@ final: prev: {
   sourcemod-include-library = final.callPackage ./sourcemod-include-library.nix {};
   sourcemod-include-curl = final.callPackage ./curl.nix {};
   sourcemod-include-steamworks = final.callPackage ./steamworks.nix {};
+  sourcemod-include-json = final.callPackage ./json.nix {};
 }
diff --git a/nix/sourcemod/sourcepawn.nix b/nix/sourcemod/sourcepawn.nix
index 11b01d3..78f2ccc 100644
--- a/nix/sourcemod/sourcepawn.nix
+++ b/nix/sourcemod/sourcepawn.nix
@@ -10,6 +10,7 @@
   sourcemod-include-curl,
   sourcemod-include-library,
   sourcemod-include-steamworks,
+  sourcemod-include-json,
   runCommand,
 }: let
   inherit (builtins) concatStringsSep substring stringLength;
@@ -66,6 +67,7 @@
         sourcemod = sourcemod-includes;
         curl = sourcemod-include-curl;
         steamworks = sourcemod-include-steamworks;
+        json = sourcemod-include-json;
       };
       buildEnv = imports: let
         unwrapped = symlinkJoin {