diff --git a/app/main.cpp b/app/main.cpp
index 64485de3b..8470d5f6e 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -36,8 +36,10 @@ static int runQtApplication(int argc, char* argv[], qtwebapp::LoggerWithFile *lo
 	QCoreApplication::setOrganizationName("f4exb");
 	QCoreApplication::setApplicationName("SDRangel");
     QCoreApplication::setApplicationVersion("4.2.4");
+#if QT_VERSION >= 0x050600
 	QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); // DPI support
     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps); //HiDPI pixmaps
+#endif
 
 #if 1
 	qApp->setStyle(QStyleFactory::create("fusion"));