diff --git a/db/migrations/20201211_add_seminare_semester_table.php b/db/migrations/20201211_add_seminare_semester_table.php
index f38e93650610101bee15980feaf506bf879c4d39..afa429576cd471b393651a288c18781069063220 100644
--- a/db/migrations/20201211_add_seminare_semester_table.php
+++ b/db/migrations/20201211_add_seminare_semester_table.php
@@ -30,7 +30,7 @@ class AddSeminareSemesterTable extends Migration
             INNER JOIN `semester_data` ON (`seminare`.`start_time` < `semester_data`.`ende`
                      AND (
                          (`seminare`.`start_time` >= `semester_data`.`beginn` AND `seminare`.`duration_time` = '0')
-                         OR (`seminare`.`duration_time` > 0 AND `seminare`.`start_time` + `seminare`.`duration_time` > `semester_data`.`beginn`)
+                         OR (`seminare`.`duration_time` > 0 AND `seminare`.`start_time` + `seminare`.`duration_time` >= `semester_data`.`beginn`)
                      )
                 )"
         );