diff --git a/tests/Unit/Crypt/AES/TestCase.php b/tests/Unit/Crypt/AES/TestCase.php
index a98d95d9..fa4ec265 100644
--- a/tests/Unit/Crypt/AES/TestCase.php
+++ b/tests/Unit/Crypt/AES/TestCase.php
@@ -74,6 +74,9 @@ abstract class Unit_Crypt_AES_Test extends PhpSeclibTestcase
         $this->assertEquals($plaintext, $actual);
     }
 
+    /**
+    * @group github451
+    */
     public function testKeyPaddingRijndael()
     {
         // this test case is from the following URL:
@@ -86,6 +89,9 @@ abstract class Unit_Crypt_AES_Test extends PhpSeclibTestcase
         $this->assertEquals($ciphertext, pack('H*', '231d844639b31b412211cfe93712b880'));
     }
 
+    /**
+    * @group github451
+    */
     public function testKeyPaddingAES()
     {
         // same as the above - just with a different ciphertext
@@ -96,4 +102,4 @@ abstract class Unit_Crypt_AES_Test extends PhpSeclibTestcase
         $ciphertext = $aes->encrypt(pack('H*', '3243f6a8885a308d313198a2e0370734'));
         $this->assertEquals($ciphertext, pack('H*', 'c109292b173f841b88e0ee49f13db8c0'));
     }
-}
+}
\ No newline at end of file