diff --git a/kmip/services/server/engine.py b/kmip/services/server/engine.py
index ed784b0..4c5ff50 100644
--- a/kmip/services/server/engine.py
+++ b/kmip/services/server/engine.py
@@ -1876,7 +1876,7 @@ class KmipEngine(object):
                     managed_object,
                     attribute_name
                 )
-                if 0 <= attribute_index <= len(existing_attributes):
+                if 0 <= attribute_index < len(existing_attributes):
                     self._set_attribute_on_managed_object_by_index(
                         managed_object,
                         attribute_name,
diff --git a/kmip/tests/unit/services/server/test_engine.py b/kmip/tests/unit/services/server/test_engine.py
index 004d7dc..617fcc1 100644
--- a/kmip/tests/unit/services/server/test_engine.py
+++ b/kmip/tests/unit/services/server/test_engine.py
@@ -4975,7 +4975,7 @@ class TestKmipEngine(testtools.TestCase):
                 attribute=attribute_factory.create_attribute(
                     enums.AttributeType.NAME,
                     "Modified Name",
-                    index=3
+                    index=1
                 )
             ),
         )