diff --git a/src/class/vendor/vendor_device.c b/src/class/vendor/vendor_device.c
index 762cbeebc..b8e6fec6f 100644
--- a/src/class/vendor/vendor_device.c
+++ b/src/class/vendor/vendor_device.c
@@ -161,12 +161,11 @@ uint32_t tud_vendor_n_write_available(uint8_t idx) {
   return tu_edpt_stream_write_available(&p_itf->stream.tx);
 }
 
-uint32_t tud_vendor_n_write_clear(uint8_t idx) {
+bool tud_vendor_n_write_clear(uint8_t idx) {
   TU_VERIFY(idx < CFG_TUD_VENDOR, 0);
   vendord_interface_t *p_itf = &_vendord_itf[idx];
-  uint32_t cnt = tu_edpt_stream_read_available(&p_itf->stream.tx);
   tu_edpt_stream_clear(&p_itf->stream.tx);
-  return cnt;
+  return true;
 }
 #endif
 
diff --git a/src/class/vendor/vendor_device.h b/src/class/vendor/vendor_device.h
index 878d7aee0..c3de4c49d 100644
--- a/src/class/vendor/vendor_device.h
+++ b/src/class/vendor/vendor_device.h
@@ -92,8 +92,8 @@ uint32_t tud_vendor_n_write_flush(uint8_t idx);
 // Return number of bytes available for writing in TX FIFO
 uint32_t tud_vendor_n_write_available(uint8_t idx);
 
-// Clear the write buffer and return the number of elements cleared
-uint32_t tud_vendor_n_write_clear(uint8_t idx);
+// Clear the transmit FIFO
+bool tud_vendor_n_write_clear(uint8_t idx);
 #endif
 
 // Write a null-terminated string to TX FIFO
@@ -152,7 +152,7 @@ TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_vendor_write_available(void) {
   return tud_vendor_n_write_available(0);
 }
 
-TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_vendor_write_clear(void) {
+TU_ATTR_ALWAYS_INLINE static inline bool tud_vendor_write_clear(void) {
   return tud_vendor_n_write_clear(0);
 }
 #endif