diff --git a/porting/npl/riot/include/nimble/nimble_npl_os.h b/porting/npl/riot/include/nimble/nimble_npl_os.h
index 0e1d387f47..854fd06c13 100644
--- a/porting/npl/riot/include/nimble/nimble_npl_os.h
+++ b/porting/npl/riot/include/nimble/nimble_npl_os.h
@@ -225,10 +225,10 @@ ble_npl_callout_set_arg(struct ble_npl_callout *co, void *arg)
     co->e.arg = arg;
 }
 
-static inline uint32_t
+static inline ble_npl_time_t
 ble_npl_time_get(void)
 {
-    return xtimer_now_usec64() / US_PER_MS;
+    return (ble_npl_time_t)(xtimer_now_usec64() / US_PER_MS);
 }
 
 static inline ble_npl_error_t
diff --git a/porting/npl/riot/src/npl_os_riot.c b/porting/npl/riot/src/npl_os_riot.c
index 2662049367..2f4efd8ba5 100644
--- a/porting/npl/riot/src/npl_os_riot.c
+++ b/porting/npl/riot/src/npl_os_riot.c
@@ -39,7 +39,8 @@ ble_npl_sem_pend(struct ble_npl_sem *sem, ble_npl_time_t timeout)
     struct timespec abs;
     uint64_t time;
 
-    time = xtimer_now_usec64() + ble_npl_time_ticks_to_ms32(timeout) * US_PER_MS;
+    time = xtimer_now_usec64() +
+        (ble_npl_time_ticks_to_ms32(timeout) * US_PER_MS);
     abs.tv_sec = (time_t)(time / US_PER_SEC);
     abs.tv_nsec = (long)((time % US_PER_SEC) * NS_PER_US);