diff --git a/atusb/fw/descr.c b/atusb/fw/descr.c
index 56447ff..f96b0ee 100644
--- a/atusb/fw/descr.c
+++ b/atusb/fw/descr.c
@@ -100,5 +100,5 @@ const uint8_t config_descriptor[] = {
 
 	/* Interface #1 */
 
-	DFU_ITF_DESCR(1, 0, dfu_proto_runtime)
+	DFU_ITF_DESCR(1, 0, dfu_proto_runtime, 0)
 };
diff --git a/atusb/fw/usb/dfu.c b/atusb/fw/usb/dfu.c
index 723221c..b15891c 100644
--- a/atusb/fw/usb/dfu.c
+++ b/atusb/fw/usb/dfu.c
@@ -46,6 +46,18 @@
 #define	DFU_ALT_SETTINGS	1
 #endif
 
+#ifndef DFU_ALT_NAME_0_IDX
+#define	DFU_ALT_NAME_0_IDX	0
+#endif
+
+#ifndef DFU_ALT_NAME_1_IDX
+#define	DFU_ALT_NAME_1_IDX	0
+#endif
+
+#ifndef DFU_ALT_NAME_2_IDX
+#define	DFU_ALT_NAME_2_IDX	0
+#endif
+
 
 const uint8_t device_descriptor[] = {
 	18,			/* bLength */
@@ -82,12 +94,12 @@ const uint8_t config_descriptor[] = {
 
 	/* Interface #0 */
 
-	DFU_ITF_DESCR(0, 0, dfu_proto_dfu)
+	DFU_ITF_DESCR(0, 0, dfu_proto_dfu, DFU_ALT_NAME_0_IDX)
 #if DFU_ALT_SETTINGS >= 1
-	DFU_ITF_DESCR(0, 1, dfu_proto_dfu)
+	DFU_ITF_DESCR(0, 1, dfu_proto_dfu, DFU_ALT_NAME_1_IDX)
 #endif
 #if DFU_ALT_SETTINGS >= 2
-	DFU_ITF_DESCR(0, 2, dfu_proto_dfu)
+	DFU_ITF_DESCR(0, 2, dfu_proto_dfu, DFU_ALT_NAME_2_IDX)
 #endif
 };
 
diff --git a/atusb/fw/usb/dfu.h b/atusb/fw/usb/dfu.h
index b77758f..9637af2 100644
--- a/atusb/fw/usb/dfu.h
+++ b/atusb/fw/usb/dfu.h
@@ -86,7 +86,7 @@ struct dfu {
 };
 
 
-#define	DFU_ITF_DESCR(itf, alt, proto)					     \
+#define	DFU_ITF_DESCR(itf, alt, proto, idx)				     \
 	9,			/* bLength */				     \
 	USB_DT_INTERFACE,	/* bDescriptorType */			     \
 	(itf),			/* bInterfaceNumber */			     \
@@ -95,7 +95,7 @@ struct dfu {
 	0xfe,			/* bInterfaceClass (application specific) */ \
 	0x01,			/* bInterfaceSubClass (device fw upgrade) */ \
 	(proto),		/* bInterfaceProtocol (dfu_proto_*) */	     \
-	0,			/* iInterface */
+	(idx),			/* iInterface */
 
 
 struct dfu_flash_ops {