diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-shareshelf.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-shareshelf.tt
index 6891891f1e..a02ebad5ed 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-shareshelf.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-shareshelf.tt
@@ -52,7 +52,7 @@
             <li><label for="name">List name:</label> [% shelfname %]</li>
             <li>
                 <label for="invite_address">Email address:</label>
-                <input id="invite_address" name="invite_address"/>
+                <input id="invite_address" name="invite_address" size="40" />
             </li>
             </ol>
         </fieldset>