diff --git a/stack.sh b/stack.sh
index 6a13eba9c6..ba546c0ab1 100755
--- a/stack.sh
+++ b/stack.sh
@@ -368,7 +368,7 @@ safe_chmod 0755 $DATA_DIR
 # Certain services such as rabbitmq require that the local hostname resolves
 # correctly.  Make sure it exists in /etc/hosts so that is always true.
 LOCAL_HOSTNAME=`hostname -s`
-if [ -z "`grep ^127.0.0.1 /etc/hosts | grep $LOCAL_HOSTNAME`" ]; then
+if ! fgrep -qwe "$LOCAL_HOSTNAME" /etc/hosts; then
     sudo sed -i "s/\(^127.0.0.1.*\)/\1 $LOCAL_HOSTNAME/" /etc/hosts
 fi