diff --git a/tests/phpunit/tests/rest-api/rest-schema-validation.php b/tests/phpunit/tests/rest-api/rest-schema-validation.php
index 20696a2cb4..fa3f327b13 100644
--- a/tests/phpunit/tests/rest-api/rest-schema-validation.php
+++ b/tests/phpunit/tests/rest-api/rest-schema-validation.php
@@ -66,7 +66,7 @@ class WP_Test_REST_Schema_Validation extends WP_UnitTestCase {
 			'format' => 'email',
 		);
 		$this->assertTrue( rest_validate_value_from_schema( 'email@example.com', $schema ) );
-		$this->assertTrue( rest_validate_value_from_schema( 'a@b.c', $schema ) );
+		$this->assertTrue( rest_validate_value_from_schema( 'a@b.co', $schema ) );
 		$this->assertWPError( rest_validate_value_from_schema( 'email', $schema ) );
 	}