diff --git a/tools/internal_ci/helper_scripts/prepare_build_macos_rc b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
index 1b856f78b03..a13c29ea7f5 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_macos_rc
+++ b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
@@ -56,9 +56,9 @@ export PYTHONPATH=/Library/Python/3.4/site-packages
 # Install Python 3.7 and Python 3.8
 time curl -O https://www.python.org/ftp/python/3.7.0/python-3.7.0-macosx10.9.pkg
 time curl -O https://www.python.org/ftp/python/3.8.0/python-3.8.0-macosx10.9.pkg
-echo "ae0717a02efea3b0eb34aadc680dc498 python-3.7.0-macosx10.9.pkg" > python_intaller_checksum.md5
-echo "f5f9ae9f416170c6355cab7256bb75b5 python-3.8.0-macosx10.9.pkg" >> python_intaller_checksum.md5
-md5sum -c python_installer_checksum.md5
+echo "ae0717a02efea3b0eb34aadc680dc498 python-3.7.0-macosx10.9.pkg" > /tmp/python_installer_checksum.md5
+echo "f5f9ae9f416170c6355cab7256bb75b5 python-3.8.0-macosx10.9.pkg" >> /tmp/python_installer_checksum.md5
+md5sum -c /tmp/python_installer_checksum.md5
 time sudo installer -pkg ./python-3.7.0-macosx10.9.pkg -target /
 time sudo installer -pkg ./python-3.8.0-macosx10.9.pkg -target /