diff --git a/atusb/fw/board.h b/atusb/fw/board.h
index c5e21e8..c4bd9c0 100644
--- a/atusb/fw/board.h
+++ b/atusb/fw/board.h
@@ -62,6 +62,8 @@
 #define	DFU_USB_PRODUCT	USB_PRODUCT
 
 
+#define	BOARD_MAX_mA	40
+
 #define	HAS_BOARD_SERNUM
 
 extern uint8_t board_sernum[42];
diff --git a/atusb/fw/descr.c b/atusb/fw/descr.c
index e5b891d..f3fb0c0 100644
--- a/atusb/fw/descr.c
+++ b/atusb/fw/descr.c
@@ -61,7 +61,7 @@ const uint8_t config_descriptor[] = {
 	1,			/* bConfigurationValue (> 0 !) */
 	0,			/* iConfiguration */
 	USB_ATTR_BUS_POWERED,	/* bmAttributes */
-	50/2,			/* bMaxPower (50 mA) */
+	((BOARD_MAX_mA)+1)/2,	/* bMaxPower */
 
 	/* Interface #0 */
 
diff --git a/atusb/fw/usb/dfu.c b/atusb/fw/usb/dfu.c
index 9ede826..6efd9fd 100644
--- a/atusb/fw/usb/dfu.c
+++ b/atusb/fw/usb/dfu.c
@@ -73,7 +73,7 @@ const uint8_t config_descriptor[] = {
 	0,			/* iConfiguration */
 //	USB_ATTR_SELF_POWERED | USB_ATTR_BUS_POWERED,
 	USB_ATTR_BUS_POWERED,	/* bmAttributes */
-	15,			/* bMaxPower */
+	((BOARD_MAX_mA)+1)/2,	/* bMaxPower */
 
 	/* Interface #0 */