diff --git a/interface/web/themes/default/templates/main.tpl.htm b/interface/web/themes/default/templates/main.tpl.htm
index c69b79db3fb2069f251c3240407c0f54bdeb6fe1..53b760e4f80f2672e36067679a4425ed03b56afe 100644
--- a/interface/web/themes/default/templates/main.tpl.htm
+++ b/interface/web/themes/default/templates/main.tpl.htm
@@ -40,7 +40,7 @@
           <div id='headerbar' class='clear'>
             <!-- logout button -->
             <tmpl_if name="cpuser">
-				<button type='button' id='logout-button' class='btn btn-sm btn-danger' data-load-content="login/logout.php"><tmpl_var format="strtoupper" name="logout_txt"> <tmpl_var format="strtoupper" name="cpuser"></button>
+				<button type='button' id='logout-button' class='btn btn-sm btn-danger text-uppercase' data-load-content="login/logout.php"><tmpl_var name="logout_txt"> <tmpl_var name="cpuser"></button>
 				<tmpl_if name='usertype' op='==' value='normaluser'>
 					<!-- search field -->
 					<form action='#' method='get' id='searchform' role='form'>