diff --git a/dist/main.js b/dist/main.js
index 8e7253c..97a3bb1 100644
--- a/dist/main.js
+++ b/dist/main.js
@@ -32,7 +32,7 @@ export class DumbPort extends Duplex {
     _write(obj, encodingOrCallback, callback) {
         const actualCallback = callback || typeof encodingOrCallback === "function" ? encodingOrCallback : undefined;
         if (Buffer.isBuffer(obj)) {
-            this.buf.writeUInt32BE(obj.byteLength);
+            this.buf.writeUInt16BE(obj.byteLength);
             obj.copy(this.buf, DumbPort.LEN_LEN);
             process.stdout.write(this.buf.subarray(0, obj.byteLength + DumbPort.LEN_LEN), actualCallback);
         }
diff --git a/src/main.ts b/src/main.ts
index 2c7013f..3e03f04 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -42,7 +42,7 @@ export class DumbPort extends Duplex {
         const actualCallback: any = callback || typeof encodingOrCallback === "function" ? encodingOrCallback : undefined;
 
         if (Buffer.isBuffer(obj)) {
-            this.buf.writeUInt32BE(obj.byteLength);
+            this.buf.writeUInt16BE(obj.byteLength);
             obj.copy(this.buf, DumbPort.LEN_LEN);
             process.stdout.write(
                 this.buf.subarray(0, obj.byteLength + DumbPort.LEN_LEN),