diff --git a/Lib/types.py b/Lib/types.py
index 53b588da756..cf643088ea9 100644
--- a/Lib/types.py
+++ b/Lib/types.py
@@ -62,7 +62,7 @@ except TypeError:
 GetSetDescriptorType = type(FunctionType.__code__)
 MemberDescriptorType = type(FunctionType.__globals__)
 
-del sys, _f, _g, _C, _c,                           # Not for export
+del sys, _f, _g, _C, _c, _ag  # Not for export
 
 
 # Provide a PEP 3115 compliant mechanism for class creation
diff --git a/Misc/NEWS.d/next/Library/2019-02-23-06-49-06.bpo-36091.26o4Lc.rst b/Misc/NEWS.d/next/Library/2019-02-23-06-49-06.bpo-36091.26o4Lc.rst
new file mode 100644
index 00000000000..582be449376
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-02-23-06-49-06.bpo-36091.26o4Lc.rst
@@ -0,0 +1 @@
+Clean up reference to async generator in Lib/types. Patch by Henry Chen.
\ No newline at end of file