diff --git a/tcl/interface/altera-usb-blaster.cfg b/tcl/interface/altera-usb-blaster.cfg
index f19abfebe..1bfef9dc4 100644
--- a/tcl/interface/altera-usb-blaster.cfg
+++ b/tcl/interface/altera-usb-blaster.cfg
@@ -5,6 +5,7 @@
 #
 
 interface usb_blaster
+usb_blaster_lowlevel_driver ftdi
 # These are already the defaults.
 # usb_blaster_vid_pid 0x09FB 0x6001
 # usb_blaster_device_desc "USB-Blaster"