diff --git a/addons/mail/static/src/css/mail.css b/addons/mail/static/src/css/mail.css
index e496c0b3990..ca6f1f3e70a 100644
--- a/addons/mail/static/src/css/mail.css
+++ b/addons/mail/static/src/css/mail.css
@@ -8,6 +8,12 @@
     background: white;
 }
 
+.openerp div.oe_mail_wall_act:after {
+    content: "";
+    display: block;
+    clear: both; 
+}
+
 /* 2 columns view */
 .openerp div.oe_mail_wall_left {
     float: left;