diff --git a/windows-installer/construct.py b/windows-installer/construct.py
index e4d40a794..46ecc21e7 100644
--- a/windows-installer/construct.py
+++ b/windows-installer/construct.py
@@ -63,7 +63,7 @@ def _prepare_build_tools(venv_path, venv_python, repo_path):
 
 @contextlib.contextmanager
 def _prepare_constraints(repo_path):
-    reqs_certbot = os.path.join(repo_path, 'tools', 'certbot_requirements.txt')
+    reqs_certbot = os.path.join(repo_path, 'tools', 'certbot_constraints.txt')
     reqs_pipstrap = os.path.join(repo_path, 'tools', 'pipstrap_constraints.txt')
     constraints_certbot = subprocess.check_output(
         [sys.executable, os.path.join(repo_path, 'tools', 'strip_hashes.py'), reqs_certbot],