diff --git a/Endpoint/Sync/ScheduleSynchronizer.cs b/Endpoint/Sync/ScheduleSynchronizer.cs
index 20d1e5d..d6cee1f 100644
--- a/Endpoint/Sync/ScheduleSynchronizer.cs
+++ b/Endpoint/Sync/ScheduleSynchronizer.cs
@@ -155,7 +155,8 @@ internal partial class ScheduleSynchronizer(UberDbContext dbContext, IOptionsSna
                 l.IsEven == groupInfo.IsEven &&
                 l.DayOfWeek == groupInfo.Day &&
                 l.PairNumber == groupInfo.Pair &&
-                l.Discipline?.Name == discipline.Name,
+                l.Discipline?.Name == discipline.Name &&
+                l.Group?.Name == group.Name,
             () =>
             {
                 var lesson = new Lesson