diff --git a/shared/tinyusb/tusb_config.h b/shared/tinyusb/tusb_config.h
index 71769b67c8..23dbd14a52 100644
--- a/shared/tinyusb/tusb_config.h
+++ b/shared/tinyusb/tusb_config.h
@@ -118,7 +118,7 @@
 #define USBD_STR_STATIC_MAX (USBD_STR_MSC + 1)
 #define USBD_EP_STATIC_MAX (EPNUM_MSC_OUT + 1)
 #elif CFG_TUD_CDC
-#define USBD_ITF_STATIC_MAX (USBD_ITF_CDC + 1)
+#define USBD_ITF_STATIC_MAX (USBD_ITF_CDC + 2)
 #define USBD_STR_STATIC_MAX (USBD_STR_CDC + 1)
 #define USBD_EP_STATIC_MAX (((EPNUM_CDC_EP_IN)&~TUSB_DIR_IN_MASK) + 1)
 #else // !CFG_TUD_MSC && !CFG_TUD_CDC