diff --git a/osx/install.sh b/osx/install.sh
index 44a790410..6e3ce6cb2 100755
--- a/osx/install.sh
+++ b/osx/install.sh
@@ -4,8 +4,8 @@
 set -e
 
 # Make sure we're run as root
-scriptname=`basename "$0"`
-if [[ $UID -ne 0 ]]; then
+scriptname=$(basename "$0")
+if [ "$UID" -ne 0 ]; then
      echo "${scriptname} must be run as root"
      exit 1
 fi