diff --git a/auto_install/install.sh b/auto_install/install.sh
index 323b7b6..738f544 100755
--- a/auto_install/install.sh
+++ b/auto_install/install.sh
@@ -1432,10 +1432,10 @@ confNetwork(){
 			fi
 			### If there is already a "*nat" section just add our POSTROUTING MASQUERADE
 			if $SUDO grep -q "*nat" /etc/ufw/before.rules; then
-				$SUDO sed "/^*nat/{n;s/\(:POSTROUTING ACCEPT .*\)/\1\n-I POSTROUTING -s ${pivpnNET}\/24 -o ${IPv4dev} -j MASQUERADE/}" -i /etc/ufw/before.rules
+				$SUDO sed "/^*nat/{n;s/\(:POSTROUTING ACCEPT .*\)/\1\n-I POSTROUTING -s ${pivpnNET}\/${subnetClass} -o ${IPv4dev} -j MASQUERADE/}" -i /etc/ufw/before.rules
 			else
-        $SUDO sed "/delete these required/i *nat\n:POSTROUTING ACCEPT [0:0]\n-I POSTROUTING -s ${pivpnNET}\/${subnetClass} -o ${IPv4dev} -j MASQUERADE\nCOMMIT\n" -i /etc/ufw/before.rules
-      fi
+				$SUDO sed "/delete these required/i *nat\n:POSTROUTING ACCEPT [0:0]\n-I POSTROUTING -s ${pivpnNET}\/${subnetClass} -o ${IPv4dev} -j MASQUERADE\nCOMMIT\n" -i /etc/ufw/before.rules
+			fi
 			# Insert rules at the beginning of the chain (in case there are other rules that may drop the traffic)
 			$SUDO ufw insert 1 allow "${pivpnPORT}"/"${pivpnPROTO}" >/dev/null
 			$SUDO ufw route insert 1 allow in on "${pivpnDEV}" from "${pivpnNET}/${subnetClass}" out on "${IPv4dev}" to any >/dev/null