diff --git a/manifest.json b/manifest.json
index 16ee9b7..e6fc012 100644
--- a/manifest.json
+++ b/manifest.json
@@ -51,14 +51,14 @@
             },
             {
                 "name": "legal",
+                "optional" : "true",
                 "ask": {
                     "en": "Indicate a web page with legal information",
                     "fr": "Indiquez la page où figure les mentions légales",
                     "de": "Tragen Sie bitte die Website ein, wo man den Impressum finden kann."
                 },    
-                "optional" : "true",
                 "example": "http://example.com",
-                "default": ""
+                "default": "no"
             },
             {
                 "name": "language",
diff --git a/sources/index.php b/sources/index.php
index 3fe0640..5e31ef7 100644
--- a/sources/index.php
+++ b/sources/index.php
@@ -101,7 +101,7 @@ echo '
                 </div>';
             }
         echo '</div>'."\n";
-        if (URL_ABOUT && !is_empty(URL_ABOUT) && URL_ABOUT!='./apropos.php')
+        if (URL_ABOUT!='./apropos.php' && URL_ABOUT!='' && URL_ABOUT!='false' && URL_ABOUT!='no')
         {
 			echo '<div class="row" style="text-align:center">'."\n";
 			echo '<a href="'.URL_ABOUT.'">'._("About").'</a>';