diff --git a/moto/core/models.py b/moto/core/models.py
index 123e753f55e8..bc16305a88c9 100644
--- a/moto/core/models.py
+++ b/moto/core/models.py
@@ -305,7 +305,7 @@ def patch_client(client: botocore.client.BaseClient) -> None:
             #  - in 99% of the cases there are no duplicate event handlers, so it doesn't matter if the check fails
             pass
 
-        client.meta.events.register("before-send", botocore_stubber)
+        client.meta.events.register("before-send", botocore_stubber)  # type: ignore[arg-type]
     else:
         raise Exception(f"Argument {client} should be of type boto3.client")