diff --git a/modoboa/extensions/webmail/templates/webmail/compose.html b/modoboa/extensions/webmail/templates/webmail/compose.html
index 9deee9786..645d56b43 100644
--- a/modoboa/extensions/webmail/templates/webmail/compose.html
+++ b/modoboa/extensions/webmail/templates/webmail/compose.html
@@ -23,11 +23,11 @@
 
     <div id="body_container">
     {% if body %}
-    <textarea id="id_body" name="body" class="editor">{% if bodyheader %}{{ bodyheader }}{% endif %}
+    <textarea id="id_body" name="body" class="form-control editor">{% if bodyheader %}{{ bodyheader }}{% endif %}
 {{ body }}
 </textarea>
     {% else %}
-    <textarea id="id_body" name="body" class="editor"></textarea>
+    <textarea id="id_body" name="body" class="form-control editor"></textarea>
     {% endif %}
     </div>
   </div>