--- src/qt5ct-qtplugin/qt5ctplatformtheme.cpp	(original)
+++ src/qt5ct-qtplugin/qt5ctplatformtheme.cpp	(working copy)
@@ -45,6 +45,7 @@
 #endif
 #include <QFile>
 #include <QFileSystemWatcher>
+#include <QProcessEnvironment>
 
 #include <qt5ct/qt5ct.h>
 #include "qt5ctplatformtheme.h"
@@ -78,6 +79,11 @@
     }
     qCDebug(lqt5ct) << "using qt5ct plugin";
 #ifdef QT_WIDGETS_LIB
+    if (!QProcessEnvironment::systemEnvironment().contains("QT5CT_NO_TRANSLUCENT")) {
+        QSurfaceFormat f = QSurfaceFormat::defaultFormat();
+        f.setAlphaBufferSize(8);
+        QSurfaceFormat::setDefaultFormat(f);
+    }
     if(!QStyleFactory::keys().contains("qt5ct-style"))
         qCCritical(lqt5ct) << "unable to find qt5ct proxy style";
 #endif