diff --git a/events.cpp b/events.cpp
--- a/events.cpp
+++ b/events.cpp
@@ -438,6 +438,9 @@
         }
         if ((dirtyProperties & NET::WMIcon) != 0)
             getIcons();
+        if ((dirtyProperties & NET::WMWindowType) != 0) {
+            updateLayer();
+        }
         // Note there's a difference between userTime() and info->userTime()
         // info->userTime() is the value of the property, userTime() also includes
         // updates of the time done by KWin (ButtonPress on windowrapper etc.).