diff --git a/geometry.cpp b/geometry.cpp
index 75df2baf42..56255db7cb 100644
--- a/geometry.cpp
+++ b/geometry.cpp
@@ -89,6 +89,9 @@ void Workspace::desktopResized()
     if (effects) {
         static_cast<EffectsHandlerImpl*>(effects)->desktopResized(geom.size());
     }
+
+    //Update the shape of the overlay window to fix redrawing of unredirected windows. bug#305781
+    m_compositor->checkUnredirect(true);
 }
 
 void Workspace::saveOldScreenSizes()