diff --git a/src/Network/Probe.php b/src/Network/Probe.php
index 1393237c8e..7955961838 100644
--- a/src/Network/Probe.php
+++ b/src/Network/Probe.php
@@ -24,6 +24,7 @@ use DomXPath;
 use DOMDocument;
 
 require_once 'include/network.php';
+require_once "include/crypto.php";
 
 /**
  * @brief This class contain functions for probing URL