QDoubleSpinBox impossible to set background using stylesheet if application is deployed with Ministro

Using stylesheet it is impossible to change the background color of a QDoubleSpinBox, if the application is deployed using Ministro. If the application is not deployed using ministro then background-color works as expected. Other widgets like QFrame, QLabel etc (I didn't test them all) have no problems with background-color, with or without Ministro.