diff --git a/src/kits/app/Handler.cpp b/src/kits/app/Handler.cpp
index 0e0bde92b9..9da37c39dc 100644
--- a/src/kits/app/Handler.cpp
+++ b/src/kits/app/Handler.cpp
@@ -688,6 +688,7 @@ ObserverList::_ValidateHandlers(uint32 what)
 			continue;
 
 		handlers.erase(iterator);
+		iterator--;
 		Add(target, what);
 	}
 }