diff --git a/bash/btrfs.sh b/bash/btrfs.sh
index 2513eda..1172d2d 100644
--- a/bash/btrfs.sh
+++ b/bash/btrfs.sh
@@ -1,7 +1,7 @@
-function bsl {
-    if [ "${1}" ] ; then
-        btrfs subvolume list "${1}" \
-        | cut -d ' ' -f 9 \
-        | sort
-    fi
+bsl() {
+	if [ -n "${1}" ]; then
+		btrfs subvolume list "${1}" |
+			cut --delimiter " " --fields 9 |
+			sort
+	fi
 }