diff --git a/packages/sdk/src/create/index.ts b/packages/sdk/src/create/index.ts
index 3c4d7ef825..e62d8ea5e3 100644
--- a/packages/sdk/src/create/index.ts
+++ b/packages/sdk/src/create/index.ts
@@ -1,2 +1,3 @@
+import "../custom-event-polyfill.js";
 export { createLightNode } from "./create.js";
 export { defaultLibp2p, createLibp2pAndUpdateOptions } from "./libp2p.js";
diff --git a/packages/sdk/src/custom-event-polyfill.ts b/packages/sdk/src/custom-event-polyfill.ts
new file mode 100644
index 0000000000..93994deff8
--- /dev/null
+++ b/packages/sdk/src/custom-event-polyfill.ts
@@ -0,0 +1,12 @@
+if (typeof CustomEvent === "undefined") {
+  class CustomEvent<T = unknown> extends Event {
+    public detail: T;
+
+    public constructor(type: string, eventInitDict?: CustomEventInit<T>) {
+      super(type, eventInitDict);
+      this.detail = eventInitDict?.detail as T;
+    }
+  }
+
+  (globalThis as Record<string, unknown>).CustomEvent = CustomEvent;
+}