diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index c34046f0e5bb6f..8c341c6ee8e11a 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -4022,7 +4022,9 @@ def test_checkline_is_not_executable(self):
 
 @support.requires_subprocess()
 class PdbTestReadline(unittest.TestCase):
-    def setUpClass():
+
+    @classmethod
+    def setUpClass(cls):
         # Ensure that the readline module is loaded
         # If this fails, the test is skipped because SkipTest will be raised
         readline = import_module('readline')