diff --git a/synapse/storage/schema/delta/18/server_keys_bigger_ints.sql b/synapse/storage/schema/delta/18/server_keys_bigger_ints.sql
index d2c70d0aa..566470ac6 100644
--- a/synapse/storage/schema/delta/18/server_keys_bigger_ints.sql
+++ b/synapse/storage/schema/delta/18/server_keys_bigger_ints.sql
@@ -21,7 +21,7 @@ CREATE TABLE IF NOT EXISTS new_server_keys_json (
     ts_added_ms BIGINT NOT NULL, -- When the keys were fetched
     ts_valid_until_ms BIGINT NOT NULL, -- When this version of the keys exipires.
     key_json bytea NOT NULL, -- JSON certificate for the remote server.
-    CONSTRAINT uniqueness UNIQUE (server_name, key_id, from_server)
+    CONSTRAINT server_keys_json_uniqueness UNIQUE (server_name, key_id, from_server)
 );
 
 INSERT INTO new_server_keys_json