1 files changed, 6 insertions, 8 deletions
diff --git a/ext/node/polyfills/http2.ts b/ext/node/polyfills/http2.ts
index c47e54d1b..efd71ff93 100644
--- a/ext/node/polyfills/http2.ts
+++ b/ext/node/polyfills/http2.ts
@@ -933,25 +933,23 @@ export class ClientHttp2Stream extends Duplex {
 
   // TODO(bartlomieju): clean up
   _write(chunk, encoding, callback?: () => void) {
-    debugHttp2(">>> _write", callback);
+    debugHttp2(">>> _write", encoding, callback);
     if (typeof encoding === "function") {
       callback = encoding;
-      encoding = "utf8";
+      encoding = this.#encoding;
     }
     let data;
-    if (typeof encoding === "string") {
+    if (encoding === "utf8") {
       data = ENCODER.encode(chunk);
-    } else {
+    } else if (encoding === "buffer") {
+      this.#encoding = encoding;
       data = chunk.buffer;
     }
 
     this.#requestPromise
       .then(() => {
         debugHttp2(">>> _write", this.#rid, data, encoding, callback);
-        return op_http2_client_send_data(
-          this.#rid,
-          data,
-        );
+        return op_http2_client_send_data(this.#rid, new Uint8Array(data));
       })
       .then(() => {
         callback?.();