diff --git a/packages/framework/lib/src/core/hooked_service.dart b/packages/framework/lib/src/core/hooked_service.dart
index 2149f14c..f8dc34a0 100644
--- a/packages/framework/lib/src/core/hooked_service.dart
+++ b/packages/framework/lib/src/core/hooked_service.dart
@@ -480,7 +480,7 @@ class HookedService<Id, Data, T extends Service<Id, Data>>
 }
 
 /// Fired when a hooked service is invoked.
-class HookedServiceEvent<Id, Data, T extends Service<Id, Data?>> {
+class HookedServiceEvent<Id, Data, T extends Service<Id, Data>> {
   static const String indexed = 'indexed';
   static const String read = 'read';
   static const String created = 'created';