diff --git a/Plugins/Flow.Launcher.Plugin.Program/AddProgramSource.xaml.cs b/Plugins/Flow.Launcher.Plugin.Program/AddProgramSource.xaml.cs
index 4276023e6..f41fd484b 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/AddProgramSource.xaml.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/AddProgramSource.xaml.cs
@@ -57,7 +57,7 @@ namespace Flow.Launcher.Plugin.Program
             }
             if (_editing == null)
             {
-                if (!ProgramSetting.ProgramSettingDisplayList.Any(x => x.UniqueIdentifier == Directory.Text))
+                if (!ProgramSetting.ProgramSettingDisplayList.Any(x => x.UniqueIdentifier.Equals(Directory.Text, System.StringComparison.InvariantCultureIgnoreCase)))
                 {
                     var source = new ProgramSource(Directory.Text);