diff --git a/kmip/services/server/crypto/engine.py b/kmip/services/server/crypto/engine.py
index e6527e4..1552770 100644
--- a/kmip/services/server/crypto/engine.py
+++ b/kmip/services/server/crypto/engine.py
@@ -269,8 +269,7 @@ class CryptographyEngine(api.CryptographicEngine):
             )
             cipher_algorithm = self._symmetric_key_algorithms.get(algorithm)
             try:
-                # ARC4 and IDEA algorithms will raise exception as CMAC
-                # requires block ciphers
+                # ARC4 and other non-block cipher algorithms will raise TypeError exceptions
                 c = cmac.CMAC(cipher_algorithm(key), backend=default_backend())
                 c.update(data)
                 mac_data = c.finalize()
diff --git a/kmip/tests/unit/services/server/crypto/test_engine.py b/kmip/tests/unit/services/server/crypto/test_engine.py
index 4adb222..edb5283 100644
--- a/kmip/tests/unit/services/server/crypto/test_engine.py
+++ b/kmip/tests/unit/services/server/crypto/test_engine.py
@@ -247,8 +247,8 @@ class TestCryptographyEngine(testtools.TestCase):
 
         engine = crypto.CryptographyEngine()
 
-        # IDEA is not block cipher so cmac should raise exception
-        args = [enums.CryptographicAlgorithm.IDEA, key, data]
+        # RC4 is not block cipher so cmac should raise exception
+        args = [enums.CryptographicAlgorithm.RC4, key, data]
         self.assertRaises(
             exceptions.CryptographicFailure,
             engine.mac,