diff --git a/addons/web/static/src/views/calendar/filter_panel/calendar_filter_panel.xml b/addons/web/static/src/views/calendar/filter_panel/calendar_filter_panel.xml
index 7ca38926481..8f08362ddec 100644
--- a/addons/web/static/src/views/calendar/filter_panel/calendar_filter_panel.xml
+++ b/addons/web/static/src/views/calendar/filter_panel/calendar_filter_panel.xml
@@ -88,7 +88,6 @@
             >
                 <span
                     class="o_cw_filter_input_bg d-flex flex-shrink-0 justify-content-center position-relative me-1 o_beside_avatar"
-                    t-att-style="filter.colorIndex and typeof filter.colorIndex !== 'number' ? `border-color: ${filter.colorIndex}; background-color: ${filter.colorIndex};` : ''"
                 >
                     <i class="fa fa-check position-relative" />
                 </span>