diff --git a/PYTHON-MANIFEST.in b/PYTHON-MANIFEST.in
index 175a47f1576..96bcdb515c9 100644
--- a/PYTHON-MANIFEST.in
+++ b/PYTHON-MANIFEST.in
@@ -7,7 +7,7 @@ graft include/grpc
 graft third_party/boringssl
 graft third_party/nanopb
 graft third_party/zlib
-include src/python/grpcio/build.py
+include src/python/grpcio/_unixccompiler_patch.py
 include src/python/grpcio/commands.py
 include src/python/grpcio/grpc_version.py
 include src/python/grpcio/grpc_core_dependencies.py