diff --git a/netjsonconfig/backends/openwrt/converters/firewall.py b/netjsonconfig/backends/openwrt/converters/firewall.py
index 7bbe233d0..7893344d5 100644
--- a/netjsonconfig/backends/openwrt/converters/firewall.py
+++ b/netjsonconfig/backends/openwrt/converters/firewall.py
@@ -64,6 +64,11 @@ def __intermediate_zones(self, zones):
             resultdict = OrderedDict(
                 ((".name", self.__get_auto_name_zone(zone)), (".type", "zone"))
             )
+            # If network contains only a single value, force the use of a UCI "option"
+            # rather than "list"".
+            network = zone["network"]
+            if len(network) == 1:
+                zone["network"] = network[0]
             resultdict.update(zone)
             result.append(resultdict)
         return result
@@ -109,6 +114,10 @@ def to_netjson_loop(self, block, result, index):
             rule = self.__netjson_rule(block)
             result["firewall"].setdefault("rules", [])
             result["firewall"]["rules"].append(rule)
+        if _type == "zone":
+            zone = self.__netjson_zone(block)
+            result["firewall"].setdefault("zones", [])
+            result["firewall"]["zones"].append(zone)
 
         return self.type_cast(result)
 
@@ -124,3 +133,19 @@ def __netjson_rule(self, rule):
                     rule["proto"] = [proto]
 
         return self.type_cast(rule)
+
+    def __netjson_zone(self, zone):
+        network = zone["network"]
+        # network may be specified as a list in a single string e.g.
+        #     option network 'wan wan6'
+        # Here we ensure that network is always a list.
+        if not isinstance(network, list):
+            zone["network"] = network.split()
+
+        if "mtu_fix" in zone:
+            zone["mtu_fix"] = zone.pop("mtu_fix") == "1"
+
+        if "masq" in zone:
+            zone["masq"] = zone.pop("masq") == "1"
+
+        return self.type_cast(zone)
diff --git a/tests/openwrt/test_firewall.py b/tests/openwrt/test_firewall.py
index 6a79ec32f..be5c23ae5 100644
--- a/tests/openwrt/test_firewall.py
+++ b/tests/openwrt/test_firewall.py
@@ -176,3 +176,109 @@ def test_render_rule_4(self):
     def test_parse_rule_4(self):
         o = OpenWrt(native=self._rule_4_uci)
         self.assertEqual(o.config, self._rule_4_netjson)
+
+    _zone_1_netjson = {
+        "firewall": {
+            "zones": [
+                {
+                    "name": "lan",
+                    "input": "ACCEPT",
+                    "output": "ACCEPT",
+                    "forward": "ACCEPT",
+                    "network": ["lan"],
+                    "mtu_fix": True,
+                }
+            ]
+        }
+    }
+
+    _zone_1_uci = textwrap.dedent(
+        """\
+        package firewall
+
+        config defaults 'defaults'
+
+        config zone 'zone_lan'
+            option name 'lan'
+            option input 'ACCEPT'
+            option output 'ACCEPT'
+            option forward 'ACCEPT'
+            option network 'lan'
+            option mtu_fix '1'
+        """
+    )
+
+    def test_render_zone_1(self):
+        o = OpenWrt(self._zone_1_netjson)
+        expected = self._tabs(self._zone_1_uci)
+        self.assertEqual(o.render(), expected)
+
+    def test_parse_zone_1(self):
+        o = OpenWrt(native=self._zone_1_uci)
+        self.assertEqual(o.config, self._zone_1_netjson)
+
+    _zone_2_netjson = {
+        "firewall": {
+            "zones": [
+                {
+                    "name": "wan",
+                    "input": "DROP",
+                    "output": "ACCEPT",
+                    "forward": "DROP",
+                    "network": ["wan", "wan6"],
+                    "mtu_fix": True,
+                    "masq": True,
+                }
+            ]
+        }
+    }
+
+    _zone_2_uci = textwrap.dedent(
+        """\
+        package firewall
+
+        config defaults 'defaults'
+
+        config zone 'zone_wan'
+            option name 'wan'
+            option input 'DROP'
+            option output 'ACCEPT'
+            option forward 'DROP'
+            list network 'wan'
+            list network 'wan6'
+            option mtu_fix '1'
+            option masq '1'
+        """
+    )
+
+    # This one is the same as _zone_2_uci with the exception that the "network"
+    # parameter is specified as a single string.
+    _zone_3_uci = textwrap.dedent(
+        """\
+        package firewall
+
+        config defaults 'defaults'
+
+        config zone 'zone_wan'
+            option name 'wan'
+            option input 'DROP'
+            option output 'ACCEPT'
+            option forward 'DROP'
+            option network 'wan wan6'
+            option mtu_fix '1'
+            option masq '1'
+        """
+    )
+
+    def test_render_zone_2(self):
+        o = OpenWrt(self._zone_2_netjson)
+        expected = self._tabs(self._zone_2_uci)
+        self.assertEqual(o.render(), expected)
+
+    def test_parse_zone_2(self):
+        o = OpenWrt(native=self._zone_2_uci)
+        self.assertEqual(o.config, self._zone_2_netjson)
+
+    def test_parse_zone_3(self):
+        o = OpenWrt(native=self._zone_3_uci)
+        self.assertEqual(o.config, self._zone_2_netjson)