diff --git a/q2a_usercheck.sh b/q2a_usercheck.sh
index dedc8b4..efa6ec2 100755
--- a/q2a_usercheck.sh
+++ b/q2a_usercheck.sh
@@ -3,7 +3,7 @@
 logf='/var/log/nginx/access.log'
 cache='/tmp/forumspam_cache'
 
-install -m 600 /dev/null $cache
+test -f $cache || install -m 600 /dev/null $cache
 
 tail -F $logf | while read line ; do
 	case $line in (*"POST"*)