diff --git a/synapse/storage/schema/delta/15/presence_indices.sql b/synapse/storage/schema/delta/15/presence_indices.sql
new file mode 100644
index 000000000..6b8d0f1ca
--- /dev/null
+++ b/synapse/storage/schema/delta/15/presence_indices.sql
@@ -0,0 +1,2 @@
+
+CREATE INDEX IF NOT EXISTS presence_list_user_id ON presence_list (user_id);