diff --git a/synapse/storage/schema/delta/20/dummy.sql b/synapse/storage/schema/delta/20/dummy.sql
new file mode 100644
index 0000000000..e0ac49d1ec
--- /dev/null
+++ b/synapse/storage/schema/delta/20/dummy.sql
@@ -0,0 +1 @@
+SELECT 1;