diff --git a/rc/bin/uptime b/rc/bin/uptime
index eba92367b..ee3b00897 100755
--- a/rc/bin/uptime
+++ b/rc/bin/uptime
@@ -1,6 +1,6 @@
 #!/bin/rc
 clock=`{cat /dev/time}
-xx=`{{echo $clock(3) / $clock(4); echo '_/86400'}|hoc|sed 's/^\./0./g;s/\..*//g'}
+xx=`{{echo $clock(5) / '(10^9)'; echo '_/86400'}|hoc|sed 's/^\./0./g;s/\..*//g'}
 sec=$xx(1)
 days=$xx(2)
 cat /dev/sysname