diff --git a/targets/TARGET_STM/TARGET_STM32F3/us_ticker_data.h b/targets/TARGET_STM/TARGET_STM32F3/us_ticker_data.h
index 043950aee9..713e11a11d 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/us_ticker_data.h
+++ b/targets/TARGET_STM/TARGET_STM32F3/us_ticker_data.h
@@ -18,13 +18,13 @@
 #define __US_TICKER_DATA_H
 
 #ifdef __cplusplus
- extern "C" {
+extern "C" {
 #endif
 
 #include "stm32f3xx.h"
 #include "stm32f3xx_ll_tim.h"
 #include "cmsis_nvic.h"
-   
+
 #define TIM_MST      TIM2
 #define TIM_MST_IRQ  TIM2_IRQn
 #define TIM_MST_RCC  __HAL_RCC_TIM2_CLK_ENABLE()