diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index e9903a73b6..ea31096374 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -966,7 +966,7 @@ class AutoField(Field):
         return int(value)
 
     def contribute_to_class(self, cls, name, **kwargs):
-        assert not cls._meta.auto_field, "A model can't have more than one AutoField."
+        assert not cls._meta.auto_field, "Model %s can't have more than one AutoField." % cls._meta.label
         super().contribute_to_class(cls, name, **kwargs)
         cls._meta.auto_field = self
 
diff --git a/tests/validation/models.py b/tests/validation/models.py
index f954cc3a4f..953370bc37 100644
--- a/tests/validation/models.py
+++ b/tests/validation/models.py
@@ -130,4 +130,4 @@ try:
         auto2 = models.AutoField(primary_key=True)
 except AssertionError as exc:
     assertion_error = exc
-assert str(assertion_error) == "A model can't have more than one AutoField."
+assert str(assertion_error) == "Model validation.MultipleAutoFields can't have more than one AutoField."