diff --git a/blocklist-update.sh b/blocklist-update.sh
index 3d7908b..f99a192 100644
--- a/blocklist-update.sh
+++ b/blocklist-update.sh
@@ -99,8 +99,14 @@ then
 	# Create the one and only firewall rule
 	$IPTABLES_PATH -I $CHAINNAME -m set --match-set $CHAINNAME src -j $ACTION >>$MAILLOG 2>&1
 fi
+
 echo "Adding the return statement to the chain. We do not want to accept a non-matching ip; think about fail2ban" >>$MAILLOG
-$IPTABLES_PATH -A $CHAINNAME -j RETURN >>$MAILLOG 2>&1
+if [ `$IPTABLES_PATH -L $CHAINNAME | grep RETURN | wc -l` -eq 0 ]
+then
+	# Create the one and only firewall rule
+	$IPTABLES_PATH -A $CHAINNAME -j RETURN >>$MAILLOG 2>&1
+fi
+
 
 ## Read all IPs from the downloaded IP list and fill up the ipset filter set
 echo "" >>$MAILLOG