diff --git a/pylint/checkers/classes/class_checker.py b/pylint/checkers/classes/class_checker.py
index 4d6e3c911da..a92f844bda8 100644
--- a/pylint/checkers/classes/class_checker.py
+++ b/pylint/checkers/classes/class_checker.py
@@ -684,7 +684,7 @@ def _has_same_layout_slots(
         "Used when a value in __slots__ conflicts with a class variable, property or method.",
     ),
     "E0243": (
-        "Invalid __class__ object",
+        "Invalid assignement to '__class__'. Should be a class definition but got a '%s'",
         "invalid-class-object",
         "Used when an invalid object is assigned to a __class__ property. "
         "Only a class is permitted.",
@@ -1579,7 +1579,12 @@ def _check_invalid_class_object(self, node: nodes.AssignAttr) -> None:
         ):
             # If is uninferable, we allow it to prevent false positives
             return
-        self.add_message("invalid-class-object", node=node, confidence=INFERENCE)
+        self.add_message(
+            "invalid-class-object",
+            node=node,
+            args=inferred.__class__.__name__,
+            confidence=INFERENCE,
+        )
 
     def _check_in_slots(self, node: nodes.AssignAttr) -> None:
         """Check that the given AssignAttr node
diff --git a/tests/functional/i/invalid/invalid_class_object.txt b/tests/functional/i/invalid/invalid_class_object.txt
index 3638965647c..cf638cec389 100644
--- a/tests/functional/i/invalid/invalid_class_object.txt
+++ b/tests/functional/i/invalid/invalid_class_object.txt
@@ -1,5 +1,5 @@
-invalid-class-object:20:0:20:11::Invalid __class__ object:INFERENCE
-invalid-class-object:21:0:21:11::Invalid __class__ object:INFERENCE
-invalid-class-object:50:8:50:22:Pylint7429Good.class_defining_function_bad:Invalid __class__ object:INFERENCE
-invalid-class-object:58:15:58:29:Pylint7429Good.class_defining_function_bad_inverted:Invalid __class__ object:INFERENCE
-invalid-class-object:62:15:62:29:Pylint7429Good.class_defining_function_complex_bad:Invalid __class__ object:INFERENCE
+invalid-class-object:20:0:20:11::Invalid assignement to '__class__'. Should be a class definition but got a 'Instance':INFERENCE
+invalid-class-object:21:0:21:11::Invalid assignement to '__class__'. Should be a class definition but got a 'Const':INFERENCE
+invalid-class-object:50:8:50:22:Pylint7429Good.class_defining_function_bad:Invalid assignement to '__class__'. Should be a class definition but got a 'Const':INFERENCE
+invalid-class-object:58:15:58:29:Pylint7429Good.class_defining_function_bad_inverted:Invalid assignement to '__class__'. Should be a class definition but got a 'Const':INFERENCE
+invalid-class-object:62:15:62:29:Pylint7429Good.class_defining_function_complex_bad:Invalid assignement to '__class__'. Should be a class definition but got a 'Const':INFERENCE