diff --git a/effects/glide/glide.cpp b/effects/glide/glide.cpp
--- a/effects/glide/glide.cpp
+++ b/effects/glide/glide.cpp
@@ -24,8 +24,17 @@
 // KConfigSkeleton
 #include "glideconfig.h"
 
+#include <QSet>
+#include <QString>
 #include <QTimeLine>
 
+static const QSet<QString> s_blacklist {
+    "ksmserver ksmserver",
+    "ksplashx ksplashx",
+    "ksplashsimple ksplashsimple",
+    "ksplashqml ksplashqml"
+};
+
 // Effect is based on fade effect by Philip Falkner
 
 namespace KWin
@@ -209,6 +218,8 @@
         return false;
     if (!w->isVisible())
         return false;
+    if (s_blacklist.contains(w->windowClass()))
+        return false;
     if (w->data(IsGlideWindow).toBool())
         return true;
     if (w->hasDecoration())