diff --git a/misc/config_tools/board_inspector/acpiparser/aml/context.py b/misc/config_tools/board_inspector/acpiparser/aml/context.py
index 075379340..ebb0dfe9d 100644
--- a/misc/config_tools/board_inspector/acpiparser/aml/context.py
+++ b/misc/config_tools/board_inspector/acpiparser/aml/context.py
@@ -11,6 +11,10 @@ from .exception import *
 from .stream import Stream
 
 class NamedDecl:
+    @staticmethod
+    def object_type():
+        return 0
+
     def __init__(self, name, tree):
         self.tree = tree
         self.name = name
@@ -66,6 +70,10 @@ class AliasDecl(NamedDecl):
         print(f"{self.name}: {self.__class__.__name__}, aliasing {self.source}")
 
 class MethodDecl(NamedDecl):
+    @staticmethod
+    def object_type():
+        return 8
+
     def __init__(self, name, nargs, tree):
         super().__init__(name, tree)
         self.nargs = nargs
@@ -74,6 +82,10 @@ class MethodDecl(NamedDecl):
         print(f"{self.name}: {self.__class__.__name__}, {self.nargs} args")
 
 class PredefinedMethodDecl(NamedDecl):
+    @staticmethod
+    def object_type():
+        return 8
+
     def __init__(self, name, nargs, fn):
         super().__init__(name, None)
         self.nargs = nargs
@@ -83,6 +95,10 @@ class PredefinedMethodDecl(NamedDecl):
         print(f"{self.name}: {self.__class__.__name__}, {self.nargs} args")
 
 class DeviceDecl(NamedDecl):
+    @staticmethod
+    def object_type():
+        return 6
+
     def __init__(self, name, tree):
         super().__init__(name, tree)
 
diff --git a/misc/config_tools/board_inspector/acpiparser/aml/parser.py b/misc/config_tools/board_inspector/acpiparser/aml/parser.py
index 6fcbf153b..324a17028 100644
--- a/misc/config_tools/board_inspector/acpiparser/aml/parser.py
+++ b/misc/config_tools/board_inspector/acpiparser/aml/parser.py
@@ -501,7 +501,7 @@ def DefExternal_hook_post(context, tree):
     ty = tree.ObjectType.value
     nargs = tree.ArgumentCount.value
 
-    if ty == 0x8:     # an external method
+    if ty == MethodDecl.object_type():
         sym = MethodDecl(name, nargs, tree)
     else:
         sym = NamedDecl(name, tree)