diff --git a/zlibrary/ui/src/qt4/tree/QtWaitingSpinner.cpp b/zlibrary/ui/src/qt4/tree/QtWaitingSpinner.cpp
index 1be8569..22c007c 100644
--- a/zlibrary/ui/src/qt4/tree/QtWaitingSpinner.cpp
+++ b/zlibrary/ui/src/qt4/tree/QtWaitingSpinner.cpp
@@ -86,7 +86,7 @@ void QtWaitingSpinner::setRadius(int radius) {
 }
 
 void QtWaitingSpinner::setRoundness(qreal roundness) {
-	myRoundness = std::max(0.0, std::min(100.0, roundness));
+	myRoundness = std::max(static_cast<qreal>(0.0), std::min(static_cast<qreal>(100.0), roundness));
 }
 
 void QtWaitingSpinner::setColor(QColor color) {
@@ -148,7 +148,7 @@ QColor QtWaitingSpinner::countTrailColor(int distance, int lines, int trail, int
 	qreal alphaDiff = color.alphaF() - (qreal)minAlphaF;
 	qreal gradation = alphaDiff / (qreal)(distanceThreshold + 1);
 	qreal resultAlpha = color.alphaF() - gradation * distance;
-	resultAlpha = std::min(1.0, std::max(0.0, resultAlpha)); //if alpha is out of bound, force it to bounds
+	resultAlpha = std::min(static_cast<qreal>(1.0), std::max(static_cast<qreal>(0.0), resultAlpha)); //if alpha is out of bound, force it to bounds
 	color.setAlphaF(resultAlpha);
 	return color;
 }