--- sys/kern/kern_time.c.orig
+++ sys/kern/kern_time.c
@@ -1631,8 +1631,11 @@
 		timespecclear(&val.it_interval);
 	}
 
-	if (ovalue != NULL)
-		realtimer_gettime(it, ovalue);
+	if (ovalue != NULL) {
+		error = realtimer_gettime(it, ovalue);
+		if (error != 0)
+			return (error);
+	}
 
 	it->it_time = val;
 	if (timespecisset(&val.it_value)) {