diff --git a/test/mercure/helpers/index.test.tsx b/test/mercure/helpers/index.test.tsx
index adc3eafd..cd93117e 100644
--- a/test/mercure/helpers/index.test.tsx
+++ b/test/mercure/helpers/index.test.tsx
@@ -20,7 +20,7 @@ describe('helpers', () => {
       [ Mock.of<MercureInfo>({ loading: false, error: false, mercureHubUrl: undefined }) ],
       [ Mock.of<MercureInfo>({ loading: true, error: true, mercureHubUrl: undefined }) ],
     ])('does not bind an EventSource when loading, error or no hub URL', (mercureInfo) => {
-      bindToMercureTopic(mercureInfo, [ '' ], identity, identity);
+      bindToMercureTopic(mercureInfo, [ '' ], identity, () => {});
 
       expect(EventSourcePolyfill).not.toHaveBeenCalled();
       expect(onMessage).not.toHaveBeenCalled();