diff --git a/tools/run_tests/build_artifact_ruby.sh b/tools/run_tests/build_artifact_ruby.sh
index 69e4dcf85aca76e9443f95fafcdea43e00464ac0..015f54f026aa4b69cd2a1d26f1dd5d33f34ba2a8 100755
--- a/tools/run_tests/build_artifact_ruby.sh
+++ b/tools/run_tests/build_artifact_ruby.sh
@@ -33,7 +33,7 @@ SYSTEM=`uname | cut -f 1 -d_`
 
 cd $(dirname $0)/../..
 if [ "$SYSTEM" == "Darwin" ] ; then
-  ./tools/distrib/build_ruby_environment_macos.sh
+  /bin/bash ./tools/distrib/build_ruby_environment_macos.sh
 fi
 set +ex
 [[ -s /etc/profile.d/rvm.sh ]] && . /etc/profile.d/rvm.sh