diff --git a/scrapy_poet/injection.py b/scrapy_poet/injection.py
index 80c94c81..693d7170 100644
--- a/scrapy_poet/injection.py
+++ b/scrapy_poet/injection.py
@@ -272,7 +272,7 @@ def build_instances_from_providers(
                 ):
                     from typing import Annotated
 
-                    cls = Annotated[cls, *metadata]
+                    cls = Annotated[(cls, *metadata)]
                 objs_by_type[cls] = obj
             extra_classes = objs_by_type.keys() - provided_classes
             if extra_classes: