diff --git a/tests/src/OneLogin/Saml2/MetadataTest.php b/tests/src/OneLogin/Saml2/MetadataTest.php
index ad789691..0c0da454 100644
--- a/tests/src/OneLogin/Saml2/MetadataTest.php
+++ b/tests/src/OneLogin/Saml2/MetadataTest.php
@@ -52,7 +52,7 @@ public function testBuilder()
         $this->assertContains('<md:OrganizationName xml:lang="en-US">sp_test</md:OrganizationName>', $metadata);
         $this->assertContains('<md:ContactPerson contactType="technical">', $metadata);
         $this->assertContains('<md:GivenName>technical_name</md:GivenName>', $metadata);
-	$this->assertContains('validUntil', $metadata);
+        $this->assertContains('validUntil', $metadata);
 
         $security['authnRequestsSigned'] = true;
         $security['wantAssertionsSigned'] = true;