diff --git a/auth/cas/cas_form.html b/auth/cas/cas_form.html
index bcc464f5dc0..52319a38699 100644
--- a/auth/cas/cas_form.html
+++ b/auth/cas/cas_form.html
@@ -1,11 +1,11 @@
 <div class="loginbox clearfix">
 <div class="loginpanel">
 <div>
-<a href="<?php echo $CFG->wwwroot.'/login/index.php?authCAS=CAS';?>"><?php print_string('accesCAS', 'auth_cas');?></a>
+<a href="<?php echo get_login_url() . '?authCAS=CAS';?>"><?php print_string('accesCAS', 'auth_cas');?></a>
 </div>
 <br/>
 <div>
-<a href="<?php echo $CFG->wwwroot.'/login/index.php?authCAS=NOCAS';?>"><?php print_string('accesNOCAS', 'auth_cas');?></a>
+<a href="<?php echo get_login_url() . '?authCAS=NOCAS';?>"><?php print_string('accesNOCAS', 'auth_cas');?></a>
 </div>
 </div>
 </div>