diff --git a/effects/glide/glide.cpp b/effects/glide/glide.cpp
index 1c065e2611..99a8c8b0b1 100644
--- a/effects/glide/glide.cpp
+++ b/effects/glide/glide.cpp
@@ -34,15 +34,23 @@ KWIN_EFFECT(glide, GlideEffect)
 KWIN_EFFECT_SUPPORTED(glide, GlideEffect::supported())
 
 static const int IsGlideWindow = 0x22A982D4;
+static Atom slideAtom;
 
 GlideEffect::GlideEffect()
 {
+    slideAtom = XInternAtom( display(), "_KDE_SLIDE", False );
+    effects->registerPropertyType( slideAtom, true );
     reconfigure(ReconfigureAll);
     connect(effects, SIGNAL(windowAdded(EffectWindow*)), this, SLOT(slotWindowAdded(EffectWindow*)));
     connect(effects, SIGNAL(windowClosed(EffectWindow*)), this, SLOT(slotWindowClosed(EffectWindow*)));
     connect(effects, SIGNAL(windowDeleted(EffectWindow*)), this, SLOT(slotWindowDeleted(EffectWindow*)));
 }
 
+GlideEffect::~GlideEffect()
+{
+    effects->registerPropertyType( slideAtom, false );
+}
+
 bool GlideEffect::supported()
 {
     return effects->compositingType() == OpenGLCompositing;
@@ -217,6 +225,8 @@ bool GlideEffect::isGlideWindow(EffectWindow* w)
         return false;
     if (w->data(IsGlideWindow).toBool())
         return true;
+    if (!w->readProperty( slideAtom, slideAtom, 32 ).isNull())
+        return false;
     if (w->hasDecoration())
         return true;
     if (!w->isManaged() || w->isMenu() ||  w->isNotification() || w->isDesktop() ||
diff --git a/effects/glide/glide.h b/effects/glide/glide.h
index 5d1714f386..000334595d 100644
--- a/effects/glide/glide.h
+++ b/effects/glide/glide.h
@@ -36,6 +36,7 @@ class GlideEffect
     Q_OBJECT
 public:
     GlideEffect();
+    ~GlideEffect();
     virtual void reconfigure(ReconfigureFlags);
     virtual void prePaintScreen(ScreenPrePaintData& data, int time);
     virtual void prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int time);