diff -up qtbase-opensource-src-5.5.0/src/gui/image/qimage_conversions.cpp.than qtbase-opensource-src-5.5.0/src/gui/image/qimage_conversions.cpp
--- qtbase-opensource-src-5.5.0/src/gui/image/qimage_conversions.cpp.than	2015-07-09 17:01:29.605707305 +0200
+++ qtbase-opensource-src-5.5.0/src/gui/image/qimage_conversions.cpp	2015-07-10 12:39:04.022599044 +0200
@@ -1103,7 +1103,7 @@ static bool mask_alpha_converter_rgbx_in
         }
         rgb_data += pad;
     }
-    data->format = DestFormat;
+    data->format = QImage::Format_RGBX8888;
     return true;
 #endif
 }