diff --git a/src/server/helpers/proxy-request.ts b/src/server/helpers/proxy-request.ts
index 03f96cb..4c121f2 100644
--- a/src/server/helpers/proxy-request.ts
+++ b/src/server/helpers/proxy-request.ts
@@ -37,7 +37,7 @@ export interface ProxyRequestOptions {
   url: string;
   method: string;
   headers: RawAxiosRequestHeaders;
-  body: string;
+  body: Buffer;
   agentOptions?: any;
   proxy?: any;
   injector?: KrasInjectorInfo;