diff --git a/src/device/usbd.c b/src/device/usbd.c
index 3437159fb..15ceec878 100644
--- a/src/device/usbd.c
+++ b/src/device/usbd.c
@@ -1,3 +1,4 @@
+
 /*
  * The MIT License (MIT)
  *
@@ -598,7 +599,7 @@ void tud_task_ext(uint32_t timeout_ms, bool in_isr)
 
       case DCD_EVENT_SOF:
         TU_LOG_USBD("\r\n");
-        if ( tud_sof_cb ) tud_sof_cb(event->rhport, event->sof.frame_count);
+        if ( tud_sof_cb ) tud_sof_cb(event->sof.frame_count);
       break;
 
       default:
diff --git a/src/device/usbd.h b/src/device/usbd.h
index db439e518..423cd7053 100644
--- a/src/device/usbd.h
+++ b/src/device/usbd.h
@@ -149,7 +149,7 @@ TU_ATTR_WEAK void tud_suspend_cb(bool remote_wakeup_en);
 TU_ATTR_WEAK void tud_resume_cb(void);
 
 // Invoked when a new (micro) frame started
-TU_ATTR_WEAK void tud_sof_cb(uint8_t rhport, uint32_t frame_count);
+TU_ATTR_WEAK void tud_sof_cb(uint32_t frame_count);
 
 // Invoked when received control request with VENDOR TYPE
 TU_ATTR_WEAK bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t const * request);