diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F303K8/device.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F303K8/device.h
index bdad16c6f1..019149b16b 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F303K8/device.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F303K8/device.h
@@ -31,13 +31,7 @@
  */
 #ifndef MBED_DEVICE_H
 #define MBED_DEVICE_H
-
-
-
-
-
-
-
+#define DEVICE_RTC_LSI 1