diff --git a/metatag.inc b/metatag.inc
index e68b5e2..d69e3fc 100644
--- a/metatag.inc
+++ b/metatag.inc
@@ -70,6 +70,11 @@ class DrupalDefaultMetaTag implements DrupalMetaTagInterface {
       foreach ($values as $ctr => $value) {
         $value = trim($value);
 
+        // Some meta tags must be output as secure URLs.
+        if (!empty($this->info['secure'])) {
+          $value = str_replace('http://', 'https://', $value);
+        }
+
         // Combine the base configuration for this meta tag with the value.
         $element = $base_element + array(
           '#theme' => 'metatag',
diff --git a/metatag_opengraph/metatag_opengraph.metatag.inc b/metatag_opengraph/metatag_opengraph.metatag.inc
index 87db077..1d22e41 100644
--- a/metatag_opengraph/metatag_opengraph.metatag.inc
+++ b/metatag_opengraph/metatag_opengraph.metatag.inc
@@ -150,8 +150,9 @@ function metatag_opengraph_metatag_info() {
 
   $info['tags']['og:image:secure_url'] = array(
     'label' => t('Open Graph secure image'),
-    'description' => t('A secure (HTTPS) image URL which should represent your object within the graph. The image must be at least 50px by 50px and have a maximum aspect ratio of 3:1. Supports PNG, JPEG and GIF formats.'),
+    'description' => t('A secure (HTTPS) image URL which should represent your object within the graph. The image must be at least 50px by 50px and have a maximum aspect ratio of 3:1. Supports PNG, JPEG and GIF formats. All "http://" URLs will automatically be converted to "https://".'),
     'multiple' => TRUE,
+    'secure' => TRUE,
     'devel_generate' => array(
       'type' => 'image',
     ),
@@ -230,7 +231,8 @@ function metatag_opengraph_metatag_info() {
   ) + $tag_info_defaults;
   $info['tags']['og:video:secure_url'] = array(
     'label' => t('Open Graph Video Secure'),
-    'description' => t('A URL to a video file that complements this object using the HTTPS protocol.'),
+    'description' => t('A URL to a video file that complements this object using the HTTPS protocol. All "http://" URLs will automatically be converted to "https://".'),
+    'secure' => TRUE,
     'devel_generate' => array(
       'type' => 'url',
     ),