diff --git a/calendar/event.go b/calendar/event.go
index 760fa22..f6e2801 100644
--- a/calendar/event.go
+++ b/calendar/event.go
@@ -41,9 +41,11 @@ func (e *Event) BeforeSave(tx *gorm.DB) (err error) {
 	// test for collide
 	cnt := ""
 	db.Raw(`select id from events e where 
-		(? >= "start" and ? <= "end" )
-		or
-		(? >= "start" and ? <= "end"  )
+		(
+			(? >= "start" and ? <= "end" )
+			or
+			(? >= "start" and ? <= "end" )
+		)
 		and calendar_id = ? and id <> ? limit 1`,
 		e.End, e.End, e.Start, e.Start, e.CalendarID, e.ID).Scan(&cnt)
 	if cnt != "" {