diff --git a/src/device/usbd.c b/src/device/usbd.c
index 5a7d72124..8fc0092eb 100644
--- a/src/device/usbd.c
+++ b/src/device/usbd.c
@@ -1149,8 +1149,8 @@ bool usbd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
 
   TU_LOG2("  Queue EP %02X with %u bytes ... ", ep_addr, total_bytes);
 
-  // Attempt to transfer on busy or not claimed (skip now) endpoint, sound like an race condition !
-  TU_ASSERT(_usbd_dev.ep_status[epnum][dir].busy == 0 /*&& _usbd_dev.ep_status[epnum][dir].claimed == 1*/);
+  // Attempt to transfer on a busy endpoint, sound like an race condition !
+  TU_ASSERT(_usbd_dev.ep_status[epnum][dir].busy == 0);
 
   // Set busy first since the actual transfer can be complete before dcd_edpt_xfer() could return
   // and usbd task can preempt and clear the busy