diff --git a/dediprog.c b/dediprog.c
index b5037a1..c6d2a30 100644
--- a/dediprog.c
+++ b/dediprog.c
@@ -294,6 +294,8 @@
 		 dev->descriptor.idVendor,
 		 dev->descriptor.idProduct);
 	dediprog_handle = usb_open(dev);
+	usb_set_configuration(dediprog_handle, 1);
+	usb_claim_interface(dediprog_handle, 0);
 	/* URB 6. Command A. */
 	if (dediprog_command_a())
 		return 1;