diff --git a/magnum/api/controllers/v1/bay.py b/magnum/api/controllers/v1/bay.py
index 7bb1a112ee..ae42847f81 100644
--- a/magnum/api/controllers/v1/bay.py
+++ b/magnum/api/controllers/v1/bay.py
@@ -83,9 +83,10 @@ class Bay(base.APIBase):
     uuid = types.uuid
     """Unique UUID for this bay"""
 
-    name = wtypes.StringType(min_length=1, max_length=255,
+    name = wtypes.StringType(min_length=1, max_length=242,
                              pattern='^[a-zA-Z][a-zA-Z0-9_.-]*$')
-    """Name of this bay"""
+    """Name of this bay, max length is limited to 242 because of heat stack
+    requires max length limit to 255, and Magnum amend a uuid length"""
 
     baymodel_id = wsme.wsproperty(wtypes.text, _get_baymodel_id,
                                   _set_baymodel_id, mandatory=True)
diff --git a/magnum/tests/unit/api/controllers/v1/test_bay.py b/magnum/tests/unit/api/controllers/v1/test_bay.py
index b5d9fd28f1..1f1306d7a1 100644
--- a/magnum/tests/unit/api/controllers/v1/test_bay.py
+++ b/magnum/tests/unit/api/controllers/v1/test_bay.py
@@ -532,7 +532,7 @@ class TestPost(api_base.FunctionalTest):
         self.assertEqual(1, response.json['master_count'])
 
     def test_create_bay_with_invalid_long_name(self):
-        bdict = apiutils.bay_post_data(name='x' * 256)
+        bdict = apiutils.bay_post_data(name='x' * 243)
         response = self.post_json('/bays', bdict, expect_errors=True)
         self.assertEqual('application/json', response.content_type)
         self.assertEqual(400, response.status_int)