diff --git a/arch/arm/arm/src/los_hw_tick.c b/arch/arm/arm/src/los_hw_tick.c
index e4689635..cc53cf9a 100644
--- a/arch/arm/arm/src/los_hw_tick.c
+++ b/arch/arm/arm/src/los_hw_tick.c
@@ -68,7 +68,7 @@ LITE_OS_SEC_TEXT_MINOR UINT64 LOS_CurrNanosec(VOID)
     UINT64 nanos;
 
     nanos = (UINT64)HalClockGetCycles() * OS_SYS_NS_PER_SECOND / g_sysClock;
-    return (UINT64)nanos;
+    return nanos;
 }
 
 LITE_OS_SEC_TEXT_MINOR VOID LOS_Udelay(UINT32 usecs)