diff --git a/shell/alias/rsync.sh b/shell/alias/rsync.sh
index a5efc09..7a94aac 100644
--- a/shell/alias/rsync.sh
+++ b/shell/alias/rsync.sh
@@ -23,7 +23,8 @@ rsda() {
 }
 
 # synchronize and delete before
-rsdb() {
+rsdb() { r_sync_delete_before "${@}"; }
+r_sync_delete_before() {
 	rsb \
 		--delete-before \
 		"${@}"