diff --git a/modules/slideshow/helpers/slideshow_theme.php b/modules/slideshow/helpers/slideshow_theme.php
index b3e30f4c..915daec2 100644
--- a/modules/slideshow/helpers/slideshow_theme.php
+++ b/modules/slideshow/helpers/slideshow_theme.php
@@ -19,7 +19,8 @@
  */
 class slideshow_theme_Core {
   static function head($theme) {
-    return "<script src=\"http://lite.piclens.com/current/piclens_optimized.js\"" .
+    $proto = (empty($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] === "off") ? "http" : "https";
+    return "<script src=\"$proto://lite.piclens.com/current/piclens_optimized.js\"" .
       "type=\"text/javascript\"></script>";
   }
 }