diff --git a/model_utils/fields.py b/model_utils/fields.py
index 35f0cc80..75dc0b03 100644
--- a/model_utils/fields.py
+++ b/model_utils/fields.py
@@ -2,7 +2,6 @@
 
 import secrets
 import uuid
-from collections.abc import Callable
 
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -329,7 +328,7 @@ def __init__(self, editable=False, max_length=128, factory=None, **kwargs):
             non-callable value for factory is not supported.
         """
 
-        if factory is not None and not isinstance(factory, Callable):
+        if factory is not None and not callable(factory):
             raise TypeError("'factory' should either be a callable or 'None'")
         self._factory = factory