diff --git a/normalize.coffee b/normalize.coffee
index 683b7d8..8c8181a 100644
--- a/normalize.coffee
+++ b/normalize.coffee
@@ -45,7 +45,7 @@ normalizers.string = (input, normType) ->
 
 
 exports.normalize = (path, value, normType) ->
-  if path of config.PARAMETERS
+  if path of config.PARAMETERS and config.PARAMETERS[path].type?
     return normalizers[config.PARAMETERS[path].type](value)
   else
     return normalizers['default'](value, normType)
diff --git a/parameters.json b/parameters.json
index f063e8e..604ce94 100644
--- a/parameters.json
+++ b/parameters.json
@@ -6,12 +6,12 @@
   "InternetGatewayDevice.DeviceInfo.ManufacturerOUI" : {"alias" : "summary.oui"},
   "InternetGatewayDevice.DeviceInfo.HardwareVersion" : {"alias" : "summary.hardwareVersion"},
   "InternetGatewayDevice.DeviceInfo.SoftwareVersion" : {"alias" : "summary.softwareVersion"},
-  "InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnection.1.MACAddress" : {"alias" : "summary.mac", "type" : "mac"},
-  "InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnection.1.ExternalIPAddress" : {"alias" : "summary.ip", "type" : "ip"},
+  "InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnection.1.MACAddress" : {"alias" : "summary.mac"},
+  "InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnection.1.ExternalIPAddress" : {"alias" : "summary.ip"},
 
-  "InternetGatewayDevice.WiMAX.Status.BSID" : {"alias" : "summary.bsid", "type" : "mac"},
-  "InternetGatewayDevice.X_CommunicationsInc_WiMAX_device_metrics.ServingBSID" : {"alias" : "summary.bsid", "type" : "mac"},
-  "InternetGatewayDevice.WANDevice.1.WiMAXInterfaceConfig.RadioModule.ServBSID" : {"alias" : "summary.bsid", "type" : "mac"},
+  "InternetGatewayDevice.WiMAX.Status.BSID" : {"alias" : "summary.bsid"},
+  "InternetGatewayDevice.X_CommunicationsInc_WiMAX_device_metrics.ServingBSID" : {"alias" : "summary.bsid"},
+  "InternetGatewayDevice.WANDevice.1.WiMAXInterfaceConfig.RadioModule.ServBSID" : {"alias" : "summary.bsid"},
 
   "InternetGatewayDevice.WiMAX.Status.RSSI" : {"alias" : "summary.rssi", "type" : "float"},
   "InternetGatewayDevice.X_MTK_WiMAX_Param.RSSI_level" : {"alias" : "summary.rssi", "type" : "float"},