diff --git a/lib/CMSIS/CM1/DeviceSupport/ST/STM32F30x/system_stm32f30x.c b/lib/CMSIS/CM1/DeviceSupport/ST/STM32F30x/system_stm32f30x.c
index aadf1bd073..8dd068b8fd 100644
--- a/lib/CMSIS/CM1/DeviceSupport/ST/STM32F30x/system_stm32f30x.c
+++ b/lib/CMSIS/CM1/DeviceSupport/ST/STM32F30x/system_stm32f30x.c
@@ -190,7 +190,7 @@ void SystemInit(void)
 
   /* Configure the System clock source, PLL Multiplier and Divider factors, 
      AHB/APBx prescalers and Flash settings ----------------------------------*/
-  SetSysClock();
+  //SetSysClock(); // called from main()
   
 #ifdef VECT_TAB_SRAM
   SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */