diff --git a/stdlib/2/unittest.pyi b/stdlib/2/unittest.pyi
index 8e8665034..ee7bead39 100644
--- a/stdlib/2/unittest.pyi
+++ b/stdlib/2/unittest.pyi
@@ -164,7 +164,7 @@ class TestCase(Testable):
     def defaultTestResult(self) -> TestResult: ...
     def id(self) -> str: ...
     def shortDescription(self) -> str: ...  # May return None
-    def addCleanup(function: Any, *args: Any, **kwargs: Any) -> None: ...
+    def addCleanup(self, function: Any, *args: Any, **kwargs: Any) -> None: ...
     def doCleanups(self) -> bool: ...
     def skipTest(self, reason: Any) -> None: ...