diff --git a/sphinx/domains/python.py b/sphinx/domains/python.py
index 3a49d6745..ac6ee4839 100644
--- a/sphinx/domains/python.py
+++ b/sphinx/domains/python.py
@@ -397,7 +397,7 @@ class PyModulelevel(PyObject):
     """
 
     def run(self) -> List[Node]:
-        warnings.warn('PyClassmember is deprecated.',
+        warnings.warn('PyModulelevel is deprecated.',
                       RemovedInSphinx40Warning)
 
         return super().run()