diff --git a/lib/statusnet.php b/lib/statusnet.php
index 6cabd3842e..d94d856c9a 100644
--- a/lib/statusnet.php
+++ b/lib/statusnet.php
@@ -396,7 +396,7 @@ class StatusNet
     static function isHTTPS()
     {
         // There are some exceptions to this; add them here!
-        return $_SERVER['HTTPS'];
+        return !empty($_SERVER['HTTPS']);
     }
 }