diff --git a/targets/TARGET_STM/us_ticker_16b.c b/targets/TARGET_STM/us_ticker_16b.c
index 25e13cc6df..1469f1d926 100644
--- a/targets/TARGET_STM/us_ticker_16b.c
+++ b/targets/TARGET_STM/us_ticker_16b.c
@@ -49,8 +49,6 @@ void us_ticker_init(void)
 
 uint32_t us_ticker_read()
 {
-    TimMasterHandle.Instance = TIM_MST;
-
     if (!us_ticker_inited) us_ticker_init();
 
     uint16_t cntH_old, cntH, cntL;