diff --git a/shell/alias/tree.sh b/shell/alias/tree.sh
index 2252fc1..dbea341 100644
--- a/shell/alias/tree.sh
+++ b/shell/alias/tree.sh
@@ -1,8 +1,8 @@
-alias t="\
-tree \
-"
+t() {
+	tree
+}
 
-alias ta="\
-tree \
--a \
-"
+ta() {
+	tree \
+		-a
+}