diff --git a/src/xlock b/src/xlock
index 4f31d43..82ad26f 100644
--- a/src/xlock
+++ b/src/xlock
@@ -4,13 +4,17 @@ unlock_f="`mktemp --suffix=.xlock`";
 log_b="0";
 
 
-# lock by default
-rm "$unlock_f";
 
-# automatic unlock if booted less than 2mins ago
-onboot=`echo "$(cat /proc/uptime | awk '{print $1}') > 1000;" | bc`;
-if [ "$onboot" -gt 0 ]; then
-	touch "$unlock_f";
+
+# returns whether the computer has just booted a few minutes ago
+booted(){
+	# onboot=`echo "$(cut -d' ' -f1 /proc/uptime) > 1000;" | bc`;
+	return echo "$(cut -d' ' -f1 /proc/uptime) > 1000;" | bc;
+}
+
+# lock by default (if not just booted)
+if [ "$(booted)" -ne 1 ]; then
+	rm "$unlock_f";
 fi;
 
 while true; do