diff --git a/libkwineffects/kwineffects.cpp b/libkwineffects/kwineffects.cpp
index d29c6343d8..3efb07a9a5 100644
--- a/libkwineffects/kwineffects.cpp
+++ b/libkwineffects/kwineffects.cpp
@@ -332,7 +332,7 @@ qreal WindowPaintData::crossFadeProgress() const
 
 void WindowPaintData::setCrossFadeProgress(qreal factor)
 {
-    d->crossFadeProgress = qBound(0.0, factor, 1.0);
+    d->crossFadeProgress = qBound(qreal(0.0), factor, qreal(1.0));
 }
 
 qreal WindowPaintData::multiplyDecorationOpacity(qreal factor)