diff --git a/src/Constraint/Format.php b/src/Constraint/Format.php
index 454b7dd..dd2200e 100644
--- a/src/Constraint/Format.php
+++ b/src/Constraint/Format.php
@@ -52,7 +52,7 @@ public static function validationError($format, $data)
             case self::IRI:
                 return Iri::validationError($data);
             case self::EMAIL:
-                return filter_var($data, FILTER_VALIDATE_EMAIL) ? null : 'Invalid email';
+                return filter_var($data, FILTER_VALIDATE_EMAIL, FILTER_FLAG_EMAIL_UNICODE) ? null : 'Invalid email';
             case self::IDN_EMAIL:
                 return count(explode('@', $data, 3)) === 2 ? null : 'Invalid email';
             case self::IPV4:
diff --git a/tests/src/PHPUnit/Suite/Issue159Test.php b/tests/src/PHPUnit/Suite/Issue159Test.php
new file mode 100644
index 0000000..6741559
--- /dev/null
+++ b/tests/src/PHPUnit/Suite/Issue159Test.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Swaggest\JsonSchema\Tests\PHPUnit\Suite;
+
+use Swaggest\JsonSchema\Exception\StringException;
+use Swaggest\JsonSchema\InvalidValue;
+use Swaggest\JsonSchema\Schema;
+
+class Issue159Test extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider emailsProvider
+     */
+    public function testIssue($expected, $email)
+    {
+        $schemaData = json_decode('{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "Root",
+  "type": "string",
+  "format": "email"
+}');
+
+        $schema = Schema::import($schemaData);
+
+        try {
+            $schema->in($email);
+            $this->assertTrue(true);
+        } catch (InvalidValue $e) {
+            $this->assertEquals('Invalid email', $e->getMessage());
+            $this->assertFalse($expected);
+        }
+    }
+
+    private function emailsProvider()
+    {
+        return [
+            [true, 'bc@example.com'],
+            [true, 'bc.123@example.com'],
+            [true, 'ser+mailbox/department=shipping@example.com'],
+            [true, '#$%&\'*+-/=?^_`.{|}~@example.com'],
+            [true, '"Abc@def"@example.com'],
+            [true, '"Fred\ Bloggs"@example.com'],
+            [true, '"Joe.\\Blow"@example.com'],
+            [false, 'коля@пример.рф'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [false, '用户@例子.广告'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [false, 'ಬೆಂಬಲ@ಡೇಟಾಮೇಲ್.ಭಾರತ'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [false, 'अजय@डाटा.भारत'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [false, 'квіточка@пошта.укр'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [false, 'χρήστης@παράδειγμα.ελ'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [false, 'Dörte@Sörensen.example.com'], // valid but FILTER_FLAG_EMAIL_UNICODE supports only unicode in the email address local part. See https://www.php.net/manual/en/filter.constants.php#constant.filter-flag-email-unicode
+            [true, 'коля@example.com'],
+            [true, '用户@example.com'],
+            [false, 'ಬೆಂಬಲ@example.com'], // valid and should be supported but it's not.
+            [true, 'अजय@example.com'],
+            [true, 'квіточка@example.com'],
+            [true, 'χρήστης@example.com'],
+            [true, 'Dörte@Sorensen.example.com'],
+            [true, 'simple@example.com'],
+            [true, 'very.common@example.com'],
+            [true, 'FirstName.LastName@EasierReading.org'],
+            [true, 'x@example.com'],
+            [true, 'long.email-address-with-hyphens@and.subdomains.example.com'],
+            [true, 'user.name+tag+sorting@example.com'],
+            [true, 'name/surname@example.com'],
+            [false, 'admin@example'], // local domain name with no TLD, although ICANN highly discourages dotless email addresses. See https://en.wikipedia.org/wiki/Email_address#cite_note-29)
+            [true, 'example@s.example'],
+            [false, '" "@example.org'], // valid. See https://en.wikipedia.org/wiki/Email_address#Internationalization
+            [true, '"john..doe"@example.org'],
+            [true, 'mailhost!username@example.org'],
+            [true, '"very.(),:;<>[]\".VERY.\"very@\\ \"very\".unusual"@strange.example.com'],
+            [true, 'user%example.com@example.org'],
+            [true, 'user-@example.org'],
+            [true, 'postmaster@[123.123.123.123]'],
+            [true, 'postmaster@[IPv6:2001:0db8:85a3:0000:0000:8a2e:0370:7334]'],
+            [true, '_test@[IPv6:2001:0db8:85a3:0000:0000:8a2e:0370:7334]'],
+        ];
+    }
+}
\ No newline at end of file