diff --git a/repositories/officeHour.go b/repositories/officeHour.go
index 21dae2b..a5de5ad 100644
--- a/repositories/officeHour.go
+++ b/repositories/officeHour.go
@@ -240,7 +240,9 @@ func (r *OfficeHourRepo) NumberByTimeSpanAndRoom(date models.Date, duration int,
 		for _, officeHour := range officeHours {
 			// increase count if officehour starts before this point in time and ends later
 			if models.DateLess(officeHour.Date, models.GetEndDate(date, minute, false)) && models.DateLess(models.GetEndDate(date, minute, false), models.GetEndDate(officeHour.Date, officeHour.Duration, false)) {
-				minuteCount += 1
+				if date.Week == 0 || officeHour.Week == 0 || date.Week == officeHour.Week { // office hours in alternating weeks should not collide
+					minuteCount += 1
+				}
 			}
 		}
 		if minuteCount > count {