diff --git a/admin/tool/behat/tests/tool_behat_test.php b/admin/tool/behat/tests/tool_behat_test.php
index 09db5e659c7..366db4acaca 100644
--- a/admin/tool/behat/tests/tool_behat_test.php
+++ b/admin/tool/behat/tests/tool_behat_test.php
@@ -150,11 +150,6 @@ class tool_behat_testcase extends advanced_testcase {
             $this->markTestSkipped('Behat not installed.');
         }
 
-        // It is possible that it has no value.
-        if (empty($CFG->behat_wwwroot)) {
-            $CFG->behat_wwwroot = behat_get_wwwroot();
-        }
-
         // To avoid user value at config.php level.
         unset($CFG->behat_config);
 
@@ -178,6 +173,9 @@ class tool_behat_testcase extends advanced_testcase {
         // directories values.
         $this->assertContains($CFG->dirroot . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'behat' . DIRECTORY_SEPARATOR . 'features', $contents);
 
+        // If it was empty should be filled by behat_config_manager::get_config_file_contents().
+        $this->assertNotNull($CFG->behat_wwwroot);
+
         // Not quoted strings.
         $this->assertContains('micarro: /me/lo/robaron', $contents);
         $this->assertContains('class: behat_init_context', $contents);
diff --git a/lib/behat/classes/behat_config_manager.php b/lib/behat/classes/behat_config_manager.php
index 11fbf4d1a3b..a1f9977bc9f 100644
--- a/lib/behat/classes/behat_config_manager.php
+++ b/lib/behat/classes/behat_config_manager.php
@@ -173,6 +173,11 @@ class behat_config_manager {
         // We require here when we are sure behat dependencies are available.
         require_once($CFG->dirroot . '/vendor/autoload.php');
 
+        // It is possible that it has no value.
+        if (empty($CFG->behat_wwwroot)) {
+            $CFG->behat_wwwroot = behat_get_wwwroot();
+        }
+
         $basedir = $CFG->dirroot . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'behat';
         $config = array(
             'default' => array(