diff --git a/effects/cube/cubeslide.cpp b/effects/cube/cubeslide.cpp
--- a/effects/cube/cubeslide.cpp
+++ b/effects/cube/cubeslide.cpp
@@ -541,7 +541,7 @@
         if (w->isDesktop()) {
             return true;
         }
-        if (!w->isManaged()) {
+        if (w->isSpecialWindow()) {
             return false;
         }
         return !dontSlideStickyWindows;