diff --git a/tools/internal_ci/macos/grpc_ios_binary_size.sh b/tools/internal_ci/macos/grpc_ios_binary_size.sh
index 17937a30d41..523e3ae8b7d 100755
--- a/tools/internal_ci/macos/grpc_ios_binary_size.sh
+++ b/tools/internal_ci/macos/grpc_ios_binary_size.sh
@@ -21,6 +21,7 @@ set -ex
 # Enter the gRPC repo root
 cd $(dirname $0)/../../..
 
+export PREPARE_BUILD_INSTALL_DEPS_OBJC=true
 source tools/internal_ci/helper_scripts/prepare_build_macos_rc
 
 tools/profiling/ios_bin/binary_size.py \