diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/system_stm32f10x.c b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/system_stm32f10x.c
index 81e69fd88d..d5d40fd3ef 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/system_stm32f10x.c
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/system_stm32f10x.c
@@ -230,6 +230,8 @@ void SystemInit (void)
   /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */
   /* Configure the Flash Latency cycles and enable prefetch buffer */
   SetSysClock();
+  
+  SystemCoreClockUpdate();
 }
 
 /**