diff --git a/wx/lib/agw/ultimatelistctrl.py b/wx/lib/agw/ultimatelistctrl.py
index 91ba9b2d..11c1ac61 100644
--- a/wx/lib/agw/ultimatelistctrl.py
+++ b/wx/lib/agw/ultimatelistctrl.py
@@ -13609,6 +13609,7 @@ class UltimateListCtrl(wx.Control):
             raise Exception("Invalid height passed to SetHeaderHeight: %s"%repr(height))
 
         self._headerWin._headerHeight = height
+        self._headerWin.InvalidateBestSize()
         self.DoLayout()