diff --git a/tests/codeigniter/libraries/Encryption_test.php b/tests/codeigniter/libraries/Encryption_test.php
index 68bc3d804dc..13d9a2b9b55 100644
--- a/tests/codeigniter/libraries/Encryption_test.php
+++ b/tests/codeigniter/libraries/Encryption_test.php
@@ -207,9 +207,6 @@ public function test_initialize_encrypt_decrypt()
 
 		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
 
-		// Try DES in ECB mode, just for the sake of changing stuff
-		$this->encryption->initialize(array('cipher' => 'des', 'mode' => 'ecb', 'key' => substr($key, 0, 8)));
-		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
 	}
 
 	// --------------------------------------------------------------------