diff --git a/system/src/Grav/Common/Page/Page.php b/system/src/Grav/Common/Page/Page.php
index 24e0214f8..7bf743fd3 100644
--- a/system/src/Grav/Common/Page/Page.php
+++ b/system/src/Grav/Common/Page/Page.php
@@ -123,7 +123,7 @@ class Page
         $this->published();
 
         if (empty($extension)) {
-            $this->extension($file->getExtension());
+            $this->extension('.'.$file->getExtension());
         } else {
             $this->extension($extension);
         }