diff --git a/openup b/openup
index 0f0c789..e29bf32 100755
--- a/openup
+++ b/openup
@@ -221,15 +221,15 @@ done
 [ $# = $(($OPTIND-1)) ] || usage
 
 if [ -z "${checkmode}" ]; then
-	if [ -z $noselfupdate ]; then update_self; fi
-	if [ -z $nosig ]; then get_cert; fi
+	if [ -z "${noselfupdate}" ]; then update_self; fi
+	if [ -z "${nosig}" ]; then get_cert; fi
 	update_binpatches
 	update_pkg
 else
 	if [ "${nosig}" -o "${noselfupdate}" -o "${dryrun}" -a -z "${_RUN2}" ]; then
 		usage
 	fi
-	if [ -z $noselfupdate ]; then update_self >/dev/null; fi
+	if [ -z "${noselfupdate}" ]; then update_self >/dev/null; fi
 	check_vuxml
 fi