diff --git a/addons/stock/views/stock_picking_views.xml b/addons/stock/views/stock_picking_views.xml
index 5e8720247ba..4e221415c2f 100644
--- a/addons/stock/views/stock_picking_views.xml
+++ b/addons/stock/views/stock_picking_views.xml
@@ -346,8 +346,7 @@
                                     <button name="action_show_details" string="Register lots, packs, location" type="object" icon="fa-list" width="0"
                                             attrs="{'invisible': [('show_details_visible', '=', False)]}" options='{"warn": true}'/>
                                     <button name="action_assign_serial" type="object"
-                                            class="btn-sm btn-primary fa fa-plus-square-o"
-                                            style="line-height: 1;"
+                                            icon="fa-plus-square"
                                             width="0"
                                             role="img" title="Assign Serial Numbers"
                                             attrs="{'invisible': [('display_assign_serial', '=', False)]}"/>