diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c8edd013c6..dcded81c7e 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -63,4 +63,4 @@ repos:
               ^examples
               | ^docs
           )
-        additional_dependencies: ["types-setuptools", "types-requests", "types-PyYAML"]
+        additional_dependencies: ["setuptools", "types-setuptools", "types-requests", "types-PyYAML"]
diff --git a/mmengine/config/config.py b/mmengine/config/config.py
index 801243c82d..b242a37c0b 100644
--- a/mmengine/config/config.py
+++ b/mmengine/config/config.py
@@ -2,6 +2,7 @@
 import ast
 import copy
 import difflib
+import inspect
 import os
 import os.path as osp
 import platform
@@ -53,6 +54,12 @@ def _lazy2string(cfg_dict, dict_type=None):
         return type(cfg_dict)(_lazy2string(v, dict_type) for v in cfg_dict)
     elif isinstance(cfg_dict, (LazyAttr, LazyObject)):
         return f'{cfg_dict.module}.{str(cfg_dict)}'
+    elif ((inspect.isclass(cfg_dict) or inspect.isfunction(cfg_dict))
+          and hasattr(cfg_dict, '__module__')
+          and hasattr(cfg_dict, '__name__')
+          and cfg_dict.__module__ != 'builtins'):
+        # Handle regular class objects by converting to module path string
+        return f"{cfg_dict.__module__}.{cfg_dict.__name__}"
     else:
         return cfg_dict