diff --git a/addons/mail/data/mail_activity_data.xml b/addons/mail/data/mail_activity_data.xml
index 0eb8c91b14df6..04acedaec7cdd 100644
--- a/addons/mail/data/mail_activity_data.xml
+++ b/addons/mail/data/mail_activity_data.xml
@@ -3,36 +3,36 @@
     <data noupdate="1">
         <record id="mail_activity_data_email" model="mail.activity.type">
             <field name="name">Email</field>
-            <field name="icon">fa fa-envelope</field>
+            <field name="icon">fa-envelope</field>
             <field name="sequence">3</field>
         </record>
         <record id="mail_activity_data_call" model="mail.activity.type">
             <field name="name">Call</field>
-            <field name="icon">fa fa-phone</field>
+            <field name="icon">fa-phone</field>
             <field name="delay_count">2</field>
             <field name="sequence">6</field>
         </record>
         <record id="mail_activity_data_meeting" model="mail.activity.type">
             <field name="name">Meeting</field>
-            <field name="icon">fa fa-users</field>
+            <field name="icon">fa-users</field>
             <field name="sequence">9</field>
         </record>
         <record id="mail_activity_data_todo" model="mail.activity.type">
             <field name="name">To Do</field>
-            <field name="icon">fa fa-tasks</field>
+            <field name="icon">fa-tasks</field>
             <field name="delay_count">5</field>
             <field name="sequence">12</field>
         </record>
         <record id="mail_activity_data_upload_document" model="mail.activity.type">
             <field name="name">Upload Document</field>
-            <field name="icon">fa fa-upload</field>
+            <field name="icon">fa-upload</field>
             <field name="delay_count">5</field>
             <field name="sequence">25</field>
             <field name="category">upload_file</field>
         </record>
         <record id="mail_activity_data_warning" model="mail.activity.type">
             <field name="name">Exception</field>
-            <field name="icon">fa fa-warning</field>
+            <field name="icon">fa-warning</field>
             <field name="delay_count">0</field>
             <field name="sequence">99</field>
             <field name="decoration_type">warning</field>
diff --git a/addons/mail/static/src/messaging/component/activity/activity.xml b/addons/mail/static/src/messaging/component/activity/activity.xml
index f639ff8e6c2d4..c8fb4fcc73ae7 100644
--- a/addons/mail/static/src/messaging/component/activity/activity.xml
+++ b/addons/mail/static/src/messaging/component/activity/activity.xml
@@ -16,7 +16,7 @@
                                 'bg-danger-full': activity.state === 'overdue',
                             }"
                         >
-                            <i t-attf-class="{{ activity.icon }}"/>
+                            <i class="fa" t-attf-class="{{ activity.icon }}"/>
                         </div>
                     </div>
                 </div>