diff --git a/src/fetch.ts b/src/fetch.ts
index 162ea45..cf41f5f 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -100,7 +100,7 @@ export function fetchEventSource(input: RequestInfo, {
         const fetch = inputFetch ?? window.fetch;
         const onopen = inputOnOpen ?? defaultOnOpen;
         async function create() {
-            curRequestController = new AbortController();
+            curRequestController = curRequestController || new AbortController();
             try {
                 const response = await fetch(input, {
                     ...rest,