diff --git a/src/handlers/handlerUtils.ts b/src/handlers/handlerUtils.ts
index 1690aab5e..6bfc2f0f8 100644
--- a/src/handlers/handlerUtils.ts
+++ b/src/handlers/handlerUtils.ts
@@ -53,7 +53,7 @@ export function constructRequest(
     const headersToAvoidForCloudflare = ['expect'];
     const headersToIgnore = [
       ...(env(c).CUSTOM_HEADERS_TO_IGNORE ?? []),
-      headersToAvoidForCloudflare,
+      ...headersToAvoidForCloudflare,
     ];
     headersToIgnore.push('content-length');
     Object.keys(requestHeaders).forEach((key: string) => {