diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 84af54c..cae4f57 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -36,7 +36,7 @@
 	union cpu_time_count ret;
 	ret.sched = 0;		/* high half always zero when .cpu used */
 	if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-		ret.sched = tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec;
+		ret.sched = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec;
 	} else {
 		ret.cpu = timespec_to_cputime(tp);
 	}