In the driver, click on the Advanced Settings tab and untick "Skip blank pages".
Note that, to make this permanent, you have to do it from Printing Defaults. Go to Printer Properties, click the Advanced tab, and the Printing Defaults button. Then proceed as above.
If you are printing via a server, you need to change the setting on the server, or it will not stay the default on the PC.
Finally, for a Mac, see this link: http://m1-onlinesupport.fujixerox.com/driver_downloads/DP225D/DP225D-OUG/SFP-OUG-EFX-0312_140917/html/index.html#GUID-C359E783-56C0-44B1-994A-64E44FDC33E8_81#KEY=skip%20blank%20page