diff --git a/package-lock.json b/package-lock.json
index fb36858..a5a7fb6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "extended-eventsource",
-  "version": "1.0.0",
+  "version": "1.5.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
diff --git a/package.json b/package.json
index 152229b..a6331b3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "extended-eventsource",
-  "version": "1.5.1",
+  "version": "1.5.2",
   "author": "Lukas Reining",
   "readme": "README.md",
   "description": "Spec compliant EventSource implementation for browsers and Node.JS",
diff --git a/src/eventsource.ts b/src/eventsource.ts
index e7df5fe..0dc0ff6 100644
--- a/src/eventsource.ts
+++ b/src/eventsource.ts
@@ -45,7 +45,7 @@ export class CustomEventSource extends EventTarget implements EventSource {
   constructor(
     url: string | URL,
     initDict?: EventSourceInit & EventSourceOptions,
-    { inputFetch } = { inputFetch: globalThis.fetch },
+    { inputFetch } = { inputFetch: globalThis.fetch.bind(globalThis) },
   ) {
     super();
     this.fetch = inputFetch;