diff --git a/app/views/projects/tree/_tree_header.html.haml b/app/views/projects/tree/_tree_header.html.haml
index 1115ca6b4c..12356dbcb6 100644
--- a/app/views/projects/tree/_tree_header.html.haml
+++ b/app/views/projects/tree/_tree_header.html.haml
@@ -14,7 +14,7 @@
   - if allowed_tree_edit?
     %li
       %span.dropdown
-        %a.dropdown-toggle.btn.add-to-tree{href: '#', "data-toggle" => "dropdown"}
+        %a.dropdown-toggle.btn.btn-sm.add-to-tree{href: '#', "data-toggle" => "dropdown"}
           = icon('plus')
         %ul.dropdown-menu
           %li