diff --git a/functions.zsh b/functions.zsh
index 3a28f83..38cef21 100644
--- a/functions.zsh
+++ b/functions.zsh
@@ -63,7 +63,7 @@ buf () {
         datepart=$(date +%Y-%m-%d);
         firstpart=`echo $oldname | cut -d "." -f 1`;
         newname=`echo $oldname | sed s/$firstpart/$firstpart.$datepart/`;
-        cp ${oldname} ${newname};
+        cp -R ${oldname} ${newname};
     fi
 }