diff --git a/rc.firewall b/rc.firewall
index 9ffd21d..6fdd456 100755
--- a/rc.firewall
+++ b/rc.firewall
@@ -35,6 +35,8 @@ if [ $CLAMPMSS ]; then
 	echo "Clamping MSS to PMTU..."
 	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
 		--clamp-mss-to-pmtu
+	iptables -A OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS \
+		--clamp-mss-to-pmtu
 
 	#$IPTABLES -t mangle -o $CLAMPMSS -A FORWARD -p tcp \
         #	--tcp-flags SYN,RST SYN -m tcpmss --mss 1400:1536 \