diff --git a/Firmware/Board/v3.3/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c b/Firmware/Board/v3.3/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c
index b2ca5f16..6ae33e8c 100644
--- a/Firmware/Board/v3.3/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c
+++ b/Firmware/Board/v3.3/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c
@@ -62,7 +62,8 @@
 #include "usbd_cdc.h"
 #include "usbd_desc.h"
 #include "usbd_ctlreq.h"
-
+#include <cmsis_os.h>	
+#include <freertos_vars.h>	
 
 /** @addtogroup STM32_USB_DEVICE_LIBRARY
   * @{
@@ -669,7 +670,7 @@ static uint8_t  USBD_CDC_DataIn (USBD_HandleTypeDef *pdev, uint8_t epnum)
   {
     
     hcdc->TxState = 0;
-
+    osSemaphoreRelease(sem_usb_tx);
     return USBD_OK;
   }
   else