diff --git a/targets/TARGET_WIZNET/TARGET_W7500x/mbed_overrides.c b/targets/TARGET_WIZNET/TARGET_W7500x/mbed_overrides.c
index 93d9c582c1..7e55f87031 100644
--- a/targets/TARGET_WIZNET/TARGET_W7500x/mbed_overrides.c
+++ b/targets/TARGET_WIZNET/TARGET_W7500x/mbed_overrides.c
@@ -35,4 +35,5 @@ void mbed_sdk_init()
 {
     // Update the SystemCoreClock variable.
     SystemInit();
+    SysTick_Config((GetSystemClock()/1000));
 }