diff --git a/pyproject.toml b/pyproject.toml
index 24762a194..5f76ae22e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ extra_standard_library = [
     "_heapq",
     "_markupbase",
     "_random",
+    "_threading_local",
     "_tkinter",
     "_tracemalloc",
     "_warnings",
diff --git a/stdlib/_threading_local.pyi b/stdlib/_threading_local.pyi
index d455ce092..98683dabc 100644
--- a/stdlib/_threading_local.pyi
+++ b/stdlib/_threading_local.pyi
@@ -14,3 +14,4 @@ class _localimpl:
 class local:
     def __getattribute__(self, name: str) -> Any: ...
     def __setattr__(self, name: str, value: Any) -> None: ...
+    def __delattr__(self, name: str) -> None: ...
diff --git a/test_cases/stdlib/test_threading.py b/test_cases/stdlib/test_threading.py
new file mode 100644
index 000000000..9b67ac540
--- /dev/null
+++ b/test_cases/stdlib/test_threading.py
@@ -0,0 +1,12 @@
+import _threading_local
+import threading
+
+loc = threading.local()
+loc.foo = 42
+del loc.foo
+loc.baz = ["spam", "eggs"]
+del loc.baz
+
+l2 = _threading_local.local()
+l2.asdfasdf = 56
+del l2.asdfasdf