diff --git a/effects/flipswitch.cpp b/effects/flipswitch.cpp
index b94ce44385..12a2840972 100644
--- a/effects/flipswitch.cpp
+++ b/effects/flipswitch.cpp
@@ -79,7 +79,6 @@ void FlipSwitchEffect::paintScreen( int mask, QRegion region, ScreenPaintData& d
         glEnable( GL_DEPTH_TEST );
         glEnable( GL_BLEND );
         glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
-        glEnable( GL_POLYGON_SMOOTH );
         glLoadIdentity();
         glFrustum(-QApplication::desktop()->geometry().width()*0.5f,
             QApplication::desktop()->geometry().width()*0.5f,