diff --git a/stm32l1xx_it.c b/stm32l1xx_it.c
--- a/stm32l1xx_it.c
+++ b/stm32l1xx_it.c
@@ -28,8 +28,11 @@
   */
 
 /* Includes ------------------------------------------------------------------*/
+#include "hw_config.h"
 #include "stm32l1xx_it.h"
 #include "main.h"
+#include "usb_lib.h"
+#include "usb_istr.h"
 
 /** @addtogroup STM32L100C-Discovery_Demo
   * @{
@@ -144,6 +147,50 @@ void SysTick_Handler(void)
   TimingDelay_Decrement();
 }
 
+
+
+
+
+
+/*******************************************************************************
+* Function Name  : USB_IRQHandler
+* Description    : This function handles USB Low Priority interrupts
+*                  requests.
+* Input          : None
+* Output         : None
+* Return         : None
+*******************************************************************************/
+#if defined(STM32L1XX_MD) || defined(STM32L1XX_HD)|| defined(STM32L1XX_MD_PLUS)|| defined (STM32F37X)
+void USB_LP_IRQHandler(void)
+#else
+void USB_LP_CAN1_RX0_IRQHandler(void)
+#endif
+{
+  USB_Istr();
+}
+
+/*******************************************************************************
+* Function Name  : USB_FS_WKUP_IRQHandler
+* Description    : This function handles USB WakeUp interrupt request.
+* Input          : None
+* Output         : None
+* Return         : None
+*******************************************************************************/
+
+#if defined(STM32L1XX_MD) || defined(STM32L1XX_HD)|| defined(STM32L1XX_MD_PLUS)
+void USB_FS_WKUP_IRQHandler(void)
+#else
+void USBWakeUp_IRQHandler(void)
+#endif
+{
+  EXTI_ClearITPendingBit(EXTI_Line18);
+}
+
+
+
+
+
+
 /******************************************************************************/
 /*                 STM32L1xx Peripherals Interrupt Handlers                   */
 /*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */
@@ -165,4 +212,7 @@ void SysTick_Handler(void)
   */ 
 
 
+
+
+
 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/