diff --git a/lib/WOPI/DiscoveryManager.php b/lib/WOPI/DiscoveryManager.php
index 5c646f8a..e4916876 100644
--- a/lib/WOPI/DiscoveryManager.php
+++ b/lib/WOPI/DiscoveryManager.php
@@ -91,7 +91,7 @@ class DiscoveryManager {
                 $replaceWith = str_replace("hostname.host", $_SERVER['HTTP_HOST'], $this->config->getAppValue('richdocuments', 'wopi_url'));
                 
                 // Use plain HTTP for .onion/TOR
-                if (strpos($this->config->getAppValue('richdocuments', 'wopi_url'), ".onion") !== FALSE) {
+                if (strpos($replaceWith, ".onion") !== FALSE) {
                     $replaceWith = str_replace("https://", "http://", $replaceWith);
                 }