diff --git a/scripts/modem/sxmo_modemdial.sh b/scripts/modem/sxmo_modemdial.sh
index 57a289c..3117279 100755
--- a/scripts/modem/sxmo_modemdial.sh
+++ b/scripts/modem/sxmo_modemdial.sh
@@ -49,6 +49,6 @@ dialmenu() {
 
 modem_n || fatalerr "Couldn't determine modem number - is modem online?"
 CREATEDCALLID="$(dialmenu)"
-if [ ! -z "$CREATEDCALLID" ]; then
+if [ -n "$CREATEDCALLID" ]; then
 	sxmo_modemcall.sh pickup "$CREATEDCALLID"
 fi