diff --git a/py25/bacpypes/app.py b/py25/bacpypes/app.py
index c5c93fa..9568f55 100755
--- a/py25/bacpypes/app.py
+++ b/py25/bacpypes/app.py
@@ -107,9 +107,9 @@ class LocalDeviceObject(DeviceObject, Logging):
 
         # check for registration
         if self.__class__ not in registered_object_types.values():
-            if 'vendorId' not in kwargs:
-                raise RuntimeError("vendorId required to auto-register the LocalDeviceObject class")
-            register_object_type(self.__class__, vendor_id=kwargs['vendorId'])
+            if 'vendorIdentifier' not in kwargs:
+                raise RuntimeError("vendorIdentifier required to auto-register the LocalDeviceObject class")
+            register_object_type(self.__class__, vendor_id=kwargs['vendorIdentifier'])
 
         # check for local time
         if 'localDate' in kwargs:
diff --git a/py27/bacpypes/app.py b/py27/bacpypes/app.py
index 4710b77..52bcd52 100755
--- a/py27/bacpypes/app.py
+++ b/py27/bacpypes/app.py
@@ -107,9 +107,9 @@ class LocalDeviceObject(DeviceObject, Logging):
 
         # check for registration
         if self.__class__ not in registered_object_types.values():
-            if 'vendorId' not in kwargs:
-                raise RuntimeError("vendorId required to auto-register the LocalDeviceObject class")
-            register_object_type(self.__class__, vendor_id=kwargs['vendorId'])
+            if 'vendorIdentifier' not in kwargs:
+                raise RuntimeError("vendorIdentifier required to auto-register the LocalDeviceObject class")
+            register_object_type(self.__class__, vendor_id=kwargs['vendorIdentifier'])
 
         # check for local time
         if 'localDate' in kwargs:
diff --git a/py34/bacpypes/app.py b/py34/bacpypes/app.py
index 9f15972..52bcd52 100755
--- a/py34/bacpypes/app.py
+++ b/py34/bacpypes/app.py
@@ -108,7 +108,7 @@ class LocalDeviceObject(DeviceObject, Logging):
         # check for registration
         if self.__class__ not in registered_object_types.values():
             if 'vendorIdentifier' not in kwargs:
-                raise RuntimeError("vendorId required to auto-register the LocalDeviceObject class")
+                raise RuntimeError("vendorIdentifier required to auto-register the LocalDeviceObject class")
             register_object_type(self.__class__, vendor_id=kwargs['vendorIdentifier'])
 
         # check for local time