diff --git a/scripts/template/lib/models.py.j2 b/scripts/template/lib/models.py.j2
index 2a0097c1d..623321884 100644
--- a/scripts/template/lib/models.py.j2
+++ b/scripts/template/lib/models.py.j2
@@ -17,4 +17,4 @@ class {{ service_class }}Backend(BaseBackend):
 
 
 available_regions = boto3.session.Session().get_available_regions("{{ service }}")
-{{ service }}_backends = {region: {{ service_class }}Backend for region in available_regions}
+{{ service }}_backends = {region: {{ service_class }}Backend(region) for region in available_regions}