diff --git a/setup.py b/setup.py
index a97f31dd4..5495d90c1 100644
--- a/setup.py
+++ b/setup.py
@@ -254,7 +254,9 @@ setup(name="tahoe-lafs", # also set in __init__.py
       python_requires="<3.0",
       install_requires=install_requires,
       extras_require={
-          ':sys_platform=="win32"': ["pypiwin32"],
+          # this pinning is temporary until an upstream issue is fixed:
+          # https://github.com/mhammond/pywin32/issues/1151
+          ':sys_platform=="win32"': ["pypiwin32==219"],
           "test": [
               "pyflakes",
               "coverage",