diff --git a/placement/objects/resource_provider.py b/placement/objects/resource_provider.py
index 3f2980f84..ff2f56af4 100644
--- a/placement/objects/resource_provider.py
+++ b/placement/objects/resource_provider.py
@@ -511,7 +511,6 @@ def _anchors_for_sharing_providers(context, rp_ids, get_id=False):
     return set([(r[0], r[1]) for r in context.session.execute(sel).fetchall()])
 
 
-@db_api.placement_context_manager.writer
 def _ensure_aggregate(ctx, agg_uuid):
     """Finds an aggregate and returns its internal ID. If not found, creates
     the aggregate and returns the new aggregate's internal ID.