diff --git a/hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/us_ticker.c b/hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/us_ticker.c
index da93ae5a5a..35045fdb3f 100644
--- a/hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/us_ticker.c
+++ b/hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/us_ticker.c
@@ -284,7 +284,7 @@ US_TICKER_HANDLER
     push {r3, lr}
     bl common_rtc_irq_handler
     pop {r3, pc}
-    nop /* padding */
+    ; ALIGN ;
 }
 
 #elif defined (__GNUC__)        /* GNU Compiler */