diff --git a/MAVProxy/tools/mavpicviewer/mavpicviewer_mosaic.py b/MAVProxy/tools/mavpicviewer/mavpicviewer_mosaic.py
index 397b9951b9..42d70151b9 100644
--- a/MAVProxy/tools/mavpicviewer/mavpicviewer_mosaic.py
+++ b/MAVProxy/tools/mavpicviewer/mavpicviewer_mosaic.py
@@ -400,6 +400,8 @@ def update_highlighting(self, filenumber):
         panel.SetBackgroundColour(background_colour)
 
         # refresh panel
+        panel.Refresh()
+        panel.Update()
         panel.Layout()
 
     # scroll to be visible