diff --git a/__mocks__/ably/index.ts b/__mocks__/ably/index.ts
index 05fdc678..a3c455ba 100644
--- a/__mocks__/ably/index.ts
+++ b/__mocks__/ably/index.ts
@@ -91,8 +91,10 @@ class MockRealtime {
   }
 }
 
+class MockErrorInfo extends ErrorInfo {}
+
 // maintain the PresenceMessage class so tests can initialise it directly using
 // PresenceMessage.fromValues.
 MockRealtime.PresenceMessage = Rest.PresenceMessage;
 
-export { MockRealtime as Realtime };
+export { MockRealtime as Realtime, MockErrorInfo as ErrorInfo };