diff --git a/pkg/datastore/sqlstore/migrations/mysql/10_alter_stats_table_constraints.sql b/pkg/datastore/sqlstore/migrations/mysql/10_alter_stats_table_constraints.sql
index 05d1617..e2e111d 100644
--- a/pkg/datastore/sqlstore/migrations/mysql/10_alter_stats_table_constraints.sql
+++ b/pkg/datastore/sqlstore/migrations/mysql/10_alter_stats_table_constraints.sql
@@ -1,8 +1,8 @@
 -- +migrate Up
 
-DROP INDEX IF EXISTS unique_daily_site_stats;
-DROP INDEX IF EXISTS unique_daily_page_stats;
-DROP INDEX IF EXISTS unique_daily_referrer_stats;
+DROP INDEX unique_daily_site_stats ON daily_site_stats; 
+DROP INDEX unique_daily_page_stats ON daily_page_stats;
+DROP INDEX unique_daily_referrer_stats ON daily_referrer_stats;
 
 CREATE UNIQUE INDEX unique_daily_site_stats ON daily_site_stats(site_id, date);
 CREATE UNIQUE INDEX unique_daily_page_stats ON daily_page_stats(site_id, hostname, pathname, date);
@@ -10,9 +10,9 @@ CREATE UNIQUE INDEX unique_daily_referrer_stats ON daily_referrer_stats(site_id,
 
 -- +migrate Down
 
-DROP INDEX IF EXISTS unique_daily_site_stats;
-DROP INDEX IF EXISTS unique_daily_page_stats;
-DROP INDEX IF EXISTS unique_daily_referrer_stats;
+DROP INDEX unique_daily_site_stats ON daily_site_stats; 
+DROP INDEX unique_daily_page_stats ON daily_page_stats;
+DROP INDEX unique_daily_referrer_stats ON daily_referrer_stats;
 
 CREATE UNIQUE INDEX unique_daily_site_stats ON daily_site_stats(date);
 CREATE UNIQUE INDEX unique_daily_page_stats ON daily_page_stats(hostname, pathname, date);