diff --git a/libraries/plugins/auth/AuthenticationCookie.php b/libraries/plugins/auth/AuthenticationCookie.php
index 990bddde31..e929455271 100644
--- a/libraries/plugins/auth/AuthenticationCookie.php
+++ b/libraries/plugins/auth/AuthenticationCookie.php
@@ -30,6 +30,19 @@ if (! empty($_REQUEST['target'])) {
  */
 require './libraries/plugins/auth/swekey/swekey.auth.lib.php';
 
+/**
+ * phpseclib
+ */
+if (! function_exists('openssl_encrypt')
+    || ! function_exists('openssl_decrypt')
+    || ! function_exists('openssl_random_pseudo_bytes')
+) {
+    include PHPSECLIB_INC_DIR . '/Crypt/Base.php';
+    include PHPSECLIB_INC_DIR . '/Crypt/Rijndael.php';
+    include PHPSECLIB_INC_DIR . '/Crypt/AES.php';
+    include PHPSECLIB_INC_DIR . '/Crypt/Random.php';
+}
+
 /**
  * Handles the cookie authentication method
  *