diff --git a/template_mustache/includes/renderer.inc b/template_mustache/includes/renderer.inc
index 15df78c..356d895 100644
--- a/template_mustache/includes/renderer.inc
+++ b/template_mustache/includes/renderer.inc
@@ -9,7 +9,7 @@ class TemplateApiMustacheRenderer extends TemplateApiRenderer {
    * @return array a render array
    */
   public function render(Template $template, $data) {
-    require self::mustache_path();
+    require_once self::mustache_path();
     $m = new TemplateApiMustache();
     $m->set_data($data);
     return array(