diff --git a/lib/Froxlor/Validate/Validate.php b/lib/Froxlor/Validate/Validate.php
index d2b7f849..c43b367f 100644
--- a/lib/Froxlor/Validate/Validate.php
+++ b/lib/Froxlor/Validate/Validate.php
@@ -217,9 +217,9 @@ class Validate
 	public static function validateDomain($domainname, $allow_underscore = false)
 	{
 		if (is_string($domainname)) {
-			$char_validation = '([a-z\d](-*[a-z\d])*)(\.?([a-z\d](-*[a-z\d])*))*\.([a-z\d])+';
+			$char_validation = '([a-z\d](-*[a-z\d])*)(\.?([a-z\d](-*[a-z\d])*))*\.(xn\-\-)?([a-z\d])+';
 			if ($allow_underscore) {
-				$char_validation = '([a-z\d\_](-*[a-z\d\_])*)(\.([a-z\d\_](-*[a-z\d])*))*(\.?([a-z\d](-*[a-z\d])*))+\.([a-z\d])+';
+				$char_validation = '([a-z\d\_](-*[a-z\d\_])*)(\.([a-z\d\_](-*[a-z\d])*))*(\.?([a-z\d](-*[a-z\d])*))+\.(xn\-\-)?([a-z\d])+';
 			}
 
 			// valid chars check && overall length check && length of each label
diff --git a/tests/Certificates/CertificatesTest.php b/tests/Certificates/CertificatesTest.php
index b1430bbc..16e0c45e 100644
--- a/tests/Certificates/CertificatesTest.php
+++ b/tests/Certificates/CertificatesTest.php
@@ -64,7 +64,7 @@ class CertificatesTest extends TestCase
 			'ssl_key_file' => $certdata['key']
 		))->add();
 		$result = json_decode($json_result, true)['data'];
-		$this->assertEquals(6, $result['domainid']);
+		$this->assertEquals(7, $result['domainid']);
 	}
 
 	public function testAdminCertificatesList()
@@ -148,7 +148,7 @@ class CertificatesTest extends TestCase
 			'ssl_key_file' => $certdata['key']
 		))->update();
 		$result = json_decode($json_result, true)['data'];
-		$this->assertEquals(6, $result['domainid']);
+		$this->assertEquals(7, $result['domainid']);
 		$this->assertEquals(str_replace("\n", "", $certdata['cert']), str_replace("\n", "", $result['ssl_cert_file']));
 	}
 
diff --git a/tests/Domains/DomainsTest.php b/tests/Domains/DomainsTest.php
index d1793fde..88ffb94b 100644
--- a/tests/Domains/DomainsTest.php
+++ b/tests/Domains/DomainsTest.php
@@ -395,4 +395,30 @@ class DomainsTest extends TestCase
 			'domainname' => 'täst.local'
 		])->delete();
 	}
+
+	/**
+	 * @refs https://github.com/Froxlor/Froxlor/issues/899
+	 */
+	public function testAdminIdn2DomainsAdd()
+	{
+		global $admin_userdata;
+		// get customer
+		$json_result = Customers::getLocal($admin_userdata, array(
+			'loginname' => 'test1'
+		))->get();
+		$customer_userdata = json_decode($json_result, true)['data'];
+		$data = [
+			'domain' => 'उदाहरण.भारत',
+			'customerid' => $customer_userdata['customerid']
+		];
+		$json_result = Domains::getLocal($admin_userdata, $data)->add();
+		$result = json_decode($json_result, true)['data'];
+		$this->assertEquals($customer_userdata['documentroot'] . 'xn--p1b6ci4b4b3a.xn--h2brj9c/', $result['documentroot']);
+		$this->assertEquals('xn--p1b6ci4b4b3a.xn--h2brj9c', $result['domain']);
+		$this->assertEquals('उदाहरण.भारत', $result['domain_ace']);
+
+		Domains::getLocal($admin_userdata, [
+			'domainname' => 'उदाहरण.भारत'
+		])->delete();
+	}
 }