diff --git a/packages/rest/src/lib/RequestManager.ts b/packages/rest/src/lib/RequestManager.ts
index 1fa1c2cba3c7..d096b540f035 100644
--- a/packages/rest/src/lib/RequestManager.ts
+++ b/packages/rest/src/lib/RequestManager.ts
@@ -415,12 +415,15 @@ export class RequestManager extends EventEmitter {
 
 		const fetchOptions = {
 			agent: this.agent,
-			body: finalBody ?? null,
 			// eslint-disable-next-line @typescript-eslint/consistent-type-assertions
 			headers: { ...(request.headers ?? {}), ...additionalHeaders, ...headers } as Record<string, string>,
 			method: request.method,
 		};
 
+		if (finalBody !== undefined) {
+			Reflect.set(fetchOptions, 'body', finalBody);
+		}
+
 		return { url, fetchOptions };
 	}