diff --git a/system_stm32l1xx.c b/system_stm32l1xx.c
--- a/system_stm32l1xx.c
+++ b/system_stm32l1xx.c
@@ -295,6 +295,8 @@ void SystemCoreClockUpdate (void)
   * @param  None
   * @retval None
   */
+uint8_t clock_fail = 0;
+
 static void SetSysClock(void)
 {
   __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
@@ -374,6 +376,7 @@ static void SetSysClock(void)
   }
   else
   {
+	clock_fail = 1;
 //	while(1);
     /* If HSE fails to start-up, the application will have wrong clock
        configuration. User can add here some code to deal with this error */