diff --git a/src/libraries/System.Private.CoreLib/src/System/Globalization/CalendarData.Windows.cs b/src/libraries/System.Private.CoreLib/src/System/Globalization/CalendarData.Windows.cs
index 917b60fe350f3..4602b06da94e2 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Globalization/CalendarData.Windows.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Globalization/CalendarData.Windows.cs
@@ -431,8 +431,6 @@ private static int NlsGetCalendars(string localeName, bool useUserOverride, Cale
         // Get native two digit year max
         internal static int GetTwoDigitYearMax(CalendarId calendarId)
         {
-            Debug.Assert(GlobalizationMode.UseNls);
-
             return GlobalizationMode.Invariant ? Invariant.iTwoDigitYearMax :
                     CallGetCalendarInfoEx(null, calendarId, CAL_ITWODIGITYEARMAX, out int twoDigitYearMax) ?
                         twoDigitYearMax :