diff --git a/runbot/templates/build.xml b/runbot/templates/build.xml
index 081903db..ad125cd8 100644
--- a/runbot/templates/build.xml
+++ b/runbot/templates/build.xml
@@ -193,7 +193,7 @@
                         <t t-foreach="build.real_build.sudo().log_ids" t-as="l">
                             <t t-set="subbuild" t-value="(([child for child in build.real_build.children_ids if child.id == int(l.path)] if l.type == 'subbuild' else False) or [build.browse()])[0]"/>
                             <t t-set="logclass" t-value="dict(CRITICAL='danger', ERROR='danger', WARNING='warning', OK='success', SEPARATOR='separator').get(l.level)"/>
-                            <tr t-attf-class="bg-{{logclass}}-light">
+                            <tr t-attf-class="'bg-%s-light' % {{logclass}} if {{logclass}} != 'separator' else {{logclass}}">
                                 <td style="white-space: nowrap; width:1%;"><t t-esc="l.create_date"/></td>
                                 <td style="white-space: nowrap; width:1%;"><b t-if="l.level != 'SEPARATOR' and l.type != 'link'" t-esc="l.level"/></td>
                                 <td style="white-space: nowrap; width:1%;"><t t-if="l.level != 'SEPARATOR' and l.type != 'link'" t-esc="l.type"/></td>