diff --git a/pkg/semtech-loramac/contrib/semtech_loramac_timer.c b/pkg/semtech-loramac/contrib/semtech_loramac_timer.c
index 9fda0f40a6..001873881c 100644
--- a/pkg/semtech-loramac/contrib/semtech_loramac_timer.c
+++ b/pkg/semtech-loramac/contrib/semtech_loramac_timer.c
@@ -75,14 +75,14 @@ TimerTime_t TimerGetCurrentTime(void)
 
 TimerTime_t TimerGetElapsedTime(TimerTime_t savedTime)
 {
-    uint64_t CurrentTime = xtimer_now_usec64();
-    return (TimerTime_t)(CurrentTime - savedTime) / US_PER_MS;
+    uint64_t CurrentTime = xtimer_now_usec64() / US_PER_MS;
+    return (TimerTime_t)(CurrentTime - savedTime);
 }
 
 TimerTime_t TimerGetFutureTime(TimerTime_t eventInFuture)
 {
-    uint64_t CurrentTime = xtimer_now_usec64();
-    return (TimerTime_t)(CurrentTime + eventInFuture) / US_PER_MS;
+    uint64_t CurrentTime = xtimer_now_usec64() / US_PER_MS;
+    return (TimerTime_t)(CurrentTime + eventInFuture);
 }
 
 void TimerLowPowerHandler( void )