diff --git a/packages/opencode/src/kilocode/session-export/worker/zstd.ts b/packages/opencode/src/kilocode/session-export/worker/zstd.ts
index f169236e0f6..25662837416 100644
--- a/packages/opencode/src/kilocode/session-export/worker/zstd.ts
+++ b/packages/opencode/src/kilocode/session-export/worker/zstd.ts
@@ -1,8 +1,15 @@
-import { zstdCompress, zstdDecompress } from "node:zlib"
 import { promisify } from "node:util"
+import * as zlib from "node:zlib"
 
-const compress = promisify(zstdCompress)
-const decompress = promisify(zstdDecompress)
+type Zstd = (bytes: Uint8Array, cb: (err: Error | null, output: Uint8Array) => void) => void
+
+const api = zlib as unknown as {
+  zstdCompress: Zstd
+  zstdDecompress: Zstd
+}
+
+const compress = promisify(api.zstdCompress)
+const decompress = promisify(api.zstdDecompress)
 
 export async function compressZstd(bytes: Uint8Array): Promise<Uint8Array> {
   return compress(bytes) as Promise<Uint8Array>