diff --git a/music-sync.sh b/music-sync.sh
index cf370b9..11bb409 100755
--- a/music-sync.sh
+++ b/music-sync.sh
@@ -127,11 +127,11 @@ GetOptions() {
 		esac
 	done
 
-	if [[ ! -z "${1}" ]]; then
+	if [[ ! -z "${1+x}" ]]; then
 		source="$1"
 	fi
 
-	if [[ ! -z "${2}" ]]; then
+	if [[ ! -z "${2+x}" ]]; then
 		dest="$2"
 	fi