diff --git a/effects/slide/slide.h b/effects/slide/slide.h
--- a/effects/slide/slide.h
+++ b/effects/slide/slide.h
@@ -23,7 +23,7 @@
 #ifndef KWIN_SLIDE_H
 #define KWIN_SLIDE_H
 
-// KDE
+// kwineffects
 #include <kwineffects.h>
 
 namespace KWin
@@ -112,11 +112,11 @@
     } m_paintCtx;
 
     struct {
-        QList<EffectWindow*> blur;
-        QList<EffectWindow*> backgroundContrast;
+        EffectWindowList blur;
+        EffectWindowList backgroundContrast;
     } m_forcedRoles;
 
-    QList<EffectWindow*> m_elevatedWindows;
+    EffectWindowList m_elevatedWindows;
 };
 
 inline int SlideEffect::duration() const
@@ -144,6 +144,6 @@
     return m_slideBackground;
 }
 
-} // namespace
+} // namespace KWin
 
 #endif
diff --git a/effects/slide/slide.cpp b/effects/slide/slide.cpp
--- a/effects/slide/slide.cpp
+++ b/effects/slide/slide.cpp
@@ -20,15 +20,17 @@
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 
-// KWayland
-#include <KWayland/Server/surface_interface.h>
-#include <KWayland/Server/blur_interface.h>
-#include <KWayland/Server/contrast_interface.h>
-
+// own
 #include "slide.h"
+
 // KConfigSkeleton
 #include "slideconfig.h"
 
+// KWayland
+#include <KWayland/Server/blur_interface.h>
+#include <KWayland/Server/contrast_interface.h>
+#include <KWayland/Server/surface_interface.h>
+
 namespace KWin
 {
 
@@ -540,4 +542,4 @@
     stop();
 }
 
-} // namespace
+} // namespace KWin