diff --git a/frontend/apps/reader/modules/readerfooter.lua b/frontend/apps/reader/modules/readerfooter.lua
index d1244d31f..c8a1dbbdf 100644
--- a/frontend/apps/reader/modules/readerfooter.lua
+++ b/frontend/apps/reader/modules/readerfooter.lua
@@ -429,6 +429,8 @@ function ReaderFooter:setTocMarkers()
     else
         self.progress_bar.ticks = nil
     end
+    -- notify caller that UI needs update
+    return true
 end
 
 function ReaderFooter:getDataFromStatistics(title, pages)