diff --git a/bun.lock b/bun.lock
index 7d5ea89d9452..2dd24d537597 100644
--- a/bun.lock
+++ b/bun.lock
@@ -525,6 +525,7 @@
         "@clack/prompts": "1.0.0-alpha.1",
         "@effect/opentelemetry": "catalog:",
         "@effect/platform-node": "catalog:",
+        "@ff-labs/fff-bun": "0.9.3",
         "@gitlab/opencode-gitlab-auth": "1.3.3",
         "@modelcontextprotocol/sdk": "1.29.0",
         "@octokit/graphql": "9.0.2",
@@ -914,6 +915,7 @@
   "patchedDependencies": {
     "solid-js@1.9.10": "patches/solid-js@1.9.10.patch",
     "virtua@0.49.1": "patches/virtua@0.49.1.patch",
+    "@ff-labs/fff-bun@0.9.3": "patches/@ff-labs%2Ffff-bun@0.9.3.patch",
     "gcp-metadata@8.1.2": "patches/gcp-metadata@8.1.2.patch",
     "@ai-sdk/google@3.0.73": "patches/@ai-sdk%2Fgoogle@3.0.73.patch",
     "@ai-sdk/xai@3.0.82": "patches/@ai-sdk%2Fxai@3.0.82.patch",
diff --git a/package.json b/package.json
index 61800b8fa74d..8ea2430ac6c6 100644
--- a/package.json
+++ b/package.json
@@ -140,6 +140,7 @@
     "@types/node": "catalog:"
   },
   "patchedDependencies": {
+    "@ff-labs/fff-bun@0.9.3": "patches/@ff-labs%2Ffff-bun@0.9.3.patch",
     "@npmcli/agent@4.0.2": "patches/@npmcli%2Fagent@4.0.2.patch",
     "@silvia-odwyer/photon-node@0.3.4": "patches/@silvia-odwyer%2Fphoton-node@0.3.4.patch",
     "@standard-community/standard-openapi@0.2.9": "patches/@standard-community%2Fstandard-openapi@0.2.9.patch",
diff --git a/packages/opencode/package.json b/packages/opencode/package.json
index 8150e1e6f450..5dff872b51fb 100644
--- a/packages/opencode/package.json
+++ b/packages/opencode/package.json
@@ -78,6 +78,7 @@
     "@clack/prompts": "1.0.0-alpha.1",
     "@effect/opentelemetry": "catalog:",
     "@effect/platform-node": "catalog:",
+    "@ff-labs/fff-bun": "0.9.3",
     "@gitlab/opencode-gitlab-auth": "1.3.3",
     "@modelcontextprotocol/sdk": "1.29.0",
     "@octokit/graphql": "9.0.2",
diff --git a/packages/opencode/script/build.ts b/packages/opencode/script/build.ts
index 782aa07c7336..236838dbdee7 100755
--- a/packages/opencode/script/build.ts
+++ b/packages/opencode/script/build.ts
@@ -140,6 +140,7 @@ const binaries: Record<string, string> = {}
 if (!skipInstall) {
   await $`bun install --os="*" --cpu="*" @opentui/core@${pkg.dependencies["@opentui/core"]}`
   await $`bun install --os="*" --cpu="*" @parcel/watcher@${pkg.dependencies["@parcel/watcher"]}`
+  await $`bun install --os="*" --cpu="*" @ff-labs/fff-bun@${pkg.dependencies["@ff-labs/fff-bun"]}`
 }
 for (const item of targets) {
   const name = [
@@ -165,7 +166,7 @@ for (const item of targets) {
   const workerRelativePath = path.relative(dir, parserWorker).replaceAll("\\", "/")
 
   await Bun.build({
-    conditions: ["node"],
+    conditions: ["bun", "node"],
     tsconfig: "./tsconfig.json",
     plugins: [plugin],
     external: ["node-gyp"],
@@ -186,6 +187,7 @@ for (const item of targets) {
     files: embeddedFileMap ? { "opencode-web-ui.gen.ts": embeddedFileMap } : {},
     entrypoints: ["./src/index.ts", parserWorker, workerPath, ...(embeddedFileMap ? ["opencode-web-ui.gen.ts"] : [])],
     define: {
+      FFF_LIBC: JSON.stringify(item.abi === "musl" ? "musl" : "gnu"),
       OPENCODE_VERSION: `'${Script.version}'`,
       OPENCODE_MODELS_DEV: generated.modelsData,
       OTUI_TREE_SITTER_WORKER_PATH: bunfsRoot + workerRelativePath,
diff --git a/patches/@ff-labs%2Ffff-bun@0.9.3.patch b/patches/@ff-labs%2Ffff-bun@0.9.3.patch
new file mode 100644
index 000000000000..23a7dd54fb15
--- /dev/null
+++ b/patches/@ff-labs%2Ffff-bun@0.9.3.patch
@@ -0,0 +1,31 @@
+diff --git a/src/download.ts b/src/download.ts
+index 3454256..6dca25a 100644
+--- a/src/download.ts
++++ b/src/download.ts
+@@ -7,7 +7,7 @@
+  */
+ 
++declare const FFF_LIBC: "gnu" | "musl";
+ import { existsSync } from "node:fs";
+-import { createRequire } from "node:module";
+ import { dirname, join } from "node:path";
+ import { fileURLToPath } from "node:url";
+ import { getLibFilename, getNpmPackageName } from "./platform";
+@@ -54,14 +54,10 @@ export function binaryExists(): boolean {
+  * in the same directory.
+  */
+ function resolveFromNpmPackage(): string | null {
+-  const packageName = getNpmPackageName();
+-
+   try {
+-    // Use createRequire to resolve the platform package's location
+-    const require = createRequire(join(getPackageDir(), "package.json"));
+-    const packageJsonPath = require.resolve(`${packageName}/package.json`);
+-    const packageDir = dirname(packageJsonPath);
+-    const binaryPath = join(packageDir, getLibFilename());
++    const binaryPath = require(
++      `@ff-labs/fff-bin-${process.platform === "linux" ? `linux-${process.arch}-${typeof FFF_LIBC === "string" ? FFF_LIBC : getNpmPackageName().endsWith("musl") ? "musl" : "gnu"}` : `${process.platform}-${process.arch}`}/${process.platform === "win32" ? "fff_c.dll" : process.platform === "darwin" ? "libfff_c.dylib" : "libfff_c.so"}`,
++    );
+ 
+     if (existsSync(binaryPath)) {
+       return binaryPath;