diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 332ed8f..173ef9e 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -1407,7 +1407,7 @@ def delx(self): del self.__x
         check(int, s)
         # class
         s = vsize(fmt +                 # PyTypeObject
-                  '3P'                  # PyAsyncMethods
+                  '4P'                  # PyAsyncMethods
                   '36P'                 # PyNumberMethods
                   '3P'                  # PyMappingMethods
                   '10P'                 # PySequenceMethods