diff --git a/webservice/externallib.php b/webservice/externallib.php
index f1d7a682b5f..095638633a2 100644
--- a/webservice/externallib.php
+++ b/webservice/externallib.php
@@ -87,6 +87,7 @@ class core_webservice_external extends external_api {
             'firstname' => $USER->firstname,
             'lastname' => $USER->lastname,
             'fullname' => fullname($USER),
+            'lang' => current_language(),
             'userid' => $USER->id,
             'userpictureurl' => $profileimageurl->out(false)
         );
@@ -175,6 +176,7 @@ class core_webservice_external extends external_api {
                 'firstname'      => new external_value(PARAM_TEXT, 'first name'),
                 'lastname'       => new external_value(PARAM_TEXT, 'last name'),
                 'fullname'       => new external_value(PARAM_TEXT, 'user full name'),
+                'lang'           => new external_value(PARAM_LANG, 'user language'),
                 'userid'         => new external_value(PARAM_INT, 'user id'),
                 'siteurl'        => new external_value(PARAM_RAW, 'site url'),
                 'userpictureurl' => new external_value(PARAM_URL, 'the user profile picture.
diff --git a/webservice/tests/externallib_test.php b/webservice/tests/externallib_test.php
index 004ae8531fe..38680875e05 100644
--- a/webservice/tests/externallib_test.php
+++ b/webservice/tests/externallib_test.php
@@ -80,6 +80,7 @@ class core_webservice_external_testcase extends externallib_advanced_testcase {
         $this->assertEquals('johnd', $siteinfo['username']);
         $this->assertEquals('John', $siteinfo['firstname']);
         $this->assertEquals('Doe', $siteinfo['lastname']);
+        $this->assertEquals(current_language(), $siteinfo['lang']);
         $this->assertEquals($USER->id, $siteinfo['userid']);
         $this->assertEquals(true, $siteinfo['downloadfiles']);
         $this->assertEquals($CFG->release, $siteinfo['release']);