diff --git a/HFUTCourseSimulation/MainWindow.xaml.cs b/HFUTCourseSimulation/MainWindow.xaml.cs
index 1644feb..3bf1df5 100644
--- a/HFUTCourseSimulation/MainWindow.xaml.cs
+++ b/HFUTCourseSimulation/MainWindow.xaml.cs
@@ -46,6 +46,7 @@ namespace HFUTCourseSimulation {
 
                 uiScheduleIndex.IsEnabled = false;
                 uiScheduleWeek.IsEnabled = false;
+                uiScheduleDay.IsEnabled = false;
 
                 uiCourseName.IsEnabled = false;
                 uiCourseDescription.IsEnabled = false;
@@ -73,6 +74,7 @@ namespace HFUTCourseSimulation {
 
                 uiScheduleIndex.IsEnabled = true;
                 uiScheduleWeek.IsEnabled = true;
+                uiScheduleDay.IsEnabled = true;
 
                 uiCourseName.IsEnabled = true;
                 uiCourseDescription.IsEnabled = true;