1 files changed, 2 insertions, 1 deletions
diff --git a/app/usb.c b/app/usb.c
index ea432ef..fc9e6ea 100644
--- a/app/usb.c
+++ b/app/usb.c
@@ -60,6 +60,7 @@ static const struct usb_config_descriptor config = {
   .bMaxPower = 0x32,
   .interface = ifaces,
 };
+#define N_USB_STRINGS  (sizeof(usb_strings)/sizeof(usb_strings[0]))
 
 static const char *usb_strings[] = {
   VENDOR_NAME, /*1*/
@@ -112,7 +113,7 @@ void  usb_init (void)
                           &dev,
                           &config,
                           usb_strings,
-                          6,
+                          N_USB_STRINGS,
                           usbd_control_buffer,
                           sizeof (usbd_control_buffer));