diff --git a/bin/seconds_since_wakeup.sh b/bin/seconds_since_wakeup.sh
index c5f4762..f2d2ab0 100755
--- a/bin/seconds_since_wakeup.sh
+++ b/bin/seconds_since_wakeup.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 
-last_wakeup_str=`grep "Enabling non-boot CPUs ..." /var/log/kern.log | tail -n 1 | cut -d ' ' -f 1-3`
+last_wakeup_str=`grep "Enabling non-boot CPUs ..." /var/log/kern.log | tail -n 1 | egrep -o '^.*..:..:..' | head -1`
 
 [ -z "$last_wakeup_str" ] &&  echo -1 && exit 1
 wakeup_unix="$(date --date="$last_wakeup_str" +%s)"