diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index 9610ac7..0618946 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -20,8 +20,7 @@
 	for_each_possible_cpu(i)
 		idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
 
-	do_posix_clock_monotonic_gettime(&uptime);
-	monotonic_to_bootbased(&uptime);
+	get_monotonic_boottime(&uptime);
 	nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC;
 	idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 	idle.tv_nsec = rem;