diff --git a/fb_social/plugins/fb_plugin/likebox.inc b/profiles/corporative_site/modules/contrib/fb_social/plugins/fb_plugin/likebox.inc
index f18b4d2..20bb499 100644
--- a/fb_social/plugins/fb_plugin/likebox.inc
+++ b/fb_social/plugins/fb_plugin/likebox.inc
@@ -108,5 +108,5 @@ function _fb_social_likebox_preprocess_fb_social_plugin(&$variables) {
   $options['show_faces'] = $options['show_faces'] ? "true" : "false";
   $options['stream'] = $options['stream'] ? "true" : "false";
   $options['header'] = $options['header'] ? "true" : "false";
-  $options['force_wall'] = $options['force_wall'] ? "true" : "false";
+  $options['force_wall'] = array_key_exists('force_wall', $options) ? "true" : "false";
 }