diff --git a/packages/seroval/src/core/Serializer.ts b/packages/seroval/src/core/Serializer.ts
index ae3f07bc..32d5632f 100644
--- a/packages/seroval/src/core/Serializer.ts
+++ b/packages/seroval/src/core/Serializer.ts
@@ -1,5 +1,4 @@
 import { crossSerializeStream } from './cross';
-import { CROSS_REFERENCE_HEADER } from './keys';
 import { serializeString } from './string';
 
 export interface SerializerOptions {
@@ -20,10 +19,6 @@ export default class Serializer {
   ) {
   }
 
-  getHeader(): string {
-    return this.options.globalIdentifier + '={};' + CROSS_REFERENCE_HEADER;
-  }
-
   write(key: string, value: unknown): void {
     if (this.alive) {
       this.cleanups.push(crossSerializeStream(value, {