diff --git a/src/corelib/time/qcalendar.cpp b/src/corelib/time/qcalendar.cpp
index 7b50eb008c..1f4eab3275 100644
--- a/src/corelib/time/qcalendar.cpp
+++ b/src/corelib/time/qcalendar.cpp
@@ -123,6 +123,8 @@ struct Registry {
 
         for (int i = 0; i <= int(QCalendar::System::Last); ++i)
             (void)QCalendar(QCalendar::System(i));
+
+        populated = true;
     }
 };