diff --git a/addons/portal/static/src/scss/portal.scss b/addons/portal/static/src/scss/portal.scss
index e342118cb88..602085e92d3 100644
--- a/addons/portal/static/src/scss/portal.scss
+++ b/addons/portal/static/src/scss/portal.scss
@@ -469,6 +469,8 @@ form label {
 
     .o_portal_chatter_messages {
         margin-bottom: 15px;
+        overflow-wrap: break-word;
+        word-break: break-word;
 
         .o_portal_chatter_message {
             div.media-body > p:not(.o_portal_chatter_puslished_date):last-of-type {