diff --git a/tools/internal_ci/helper_scripts/prepare_build_macos_rc b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
index 2a7fa4cb7ef..fcead59038a 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_macos_rc
+++ b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
@@ -94,7 +94,6 @@ then
   # make sure md5sum is available (requires coreutils 8.31+)
   brew update
   brew upgrade coreutils
-  brew install md5sha1sum
 
   # 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