diff --git a/FSCalendar/FSCalendar.m b/FSCalendar/FSCalendar.m
index 5c1bbab..69cd72d 100644
--- a/FSCalendar/FSCalendar.m
+++ b/FSCalendar/FSCalendar.m
@@ -1478,6 +1478,7 @@ void FSCalendarRunLoopCallback(CFRunLoopObserverRef observer, CFRunLoopActivity
 - (void)invalidateHeaders
 {
     [self.calendarHeaderView.collectionView reloadData];
+    [self.visibleStickyHeaders makeObjectsPerformSelector:@selector(configureAppearance)];
 }
 
 - (void)invalidateAppearanceForCell:(FSCalendarCell *)cell forDate:(NSDate *)date