diff --git a/stack.sh b/stack.sh
index 32eb43f..266ae7c 100755
--- a/stack.sh
+++ b/stack.sh
@@ -353,7 +353,7 @@
 # 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