diff --git a/htdocs/core/class/menubase.class.php b/htdocs/core/class/menubase.class.php
index 5ebccdeb1bd..6777c37b374 100644
--- a/htdocs/core/class/menubase.class.php
+++ b/htdocs/core/class/menubase.class.php
@@ -535,7 +535,7 @@ class Menubase
                 if ($menu['perms'])
                 {
                 	$tmpcond=$menu['perms'];
-                	if ($leftmenu == 'all') $tmpcond=preg_replace('/\$leftmenu\s*==\s*["\'a-zA-Z]+/','1==1',$tmpcond);	// Force part of condition to true
+                	if ($leftmenu == 'all') $tmpcond=preg_replace('/\$leftmenu\s*==\s*["\'a-zA-Z_]+/','1==1',$tmpcond);	// Force part of condition to true
                 	$perms = verifCond($tmpcond);
                     //print "verifCond rowid=".$menu['rowid']." ".$tmpcond.":".$perms."<br>\n";
                 }
@@ -545,7 +545,7 @@ class Menubase
                 if ($menu['enabled'])
                 {
                 	$tmpcond=$menu['enabled'];
-                	if ($leftmenu == 'all') $tmpcond=preg_replace('/\$leftmenu\s*==\s*["\'a-zA-Z]+/','1==1',$tmpcond);	// Force part of condition to true
+                	if ($leftmenu == 'all') $tmpcond=preg_replace('/\$leftmenu\s*==\s*["\'a-zA-Z_]+/','1==1',$tmpcond);	// Force part of condition to true
                     $enabled = verifCond($tmpcond);
                     if ($conf->use_javascript_ajax && ! empty($conf->global->MAIN_MENU_USE_JQUERY_ACCORDION) && preg_match('/^\$leftmenu/',$menu['enabled'])) $enabled=1;
                     //print "verifCond rowid=".$menu['rowid']." ".$tmpcond.":".$enabled."<br>\n";