diff --git a/heatclient/common/environment_format.py b/heatclient/common/environment_format.py
index c5f3e942..179a2055 100644
--- a/heatclient/common/environment_format.py
+++ b/heatclient/common/environment_format.py
@@ -16,8 +16,11 @@ from heatclient.openstack.common._i18n import _
 import yaml
 
 
-SECTIONS = (PARAMETER_DEFAULTS, PARAMETERS, RESOURCE_REGISTRY) = \
-           ('parameter_defaults', 'parameters', 'resource_registry')
+SECTIONS = (
+    PARAMETER_DEFAULTS, PARAMETERS, RESOURCE_REGISTRY, EVENT_SINKS
+) = (
+    'parameter_defaults', 'parameters', 'resource_registry', 'event_sinks'
+)
 
 
 def parse(env_str):
diff --git a/heatclient/tests/unit/test_environment_format.py b/heatclient/tests/unit/test_environment_format.py
index faea505d..e4145b95 100644
--- a/heatclient/tests/unit/test_environment_format.py
+++ b/heatclient/tests/unit/test_environment_format.py
@@ -30,6 +30,7 @@ class YamlEnvironmentTest(testtools.TestCase):
 parameter_defaults: {}
 parameters: {}
 resource_registry: {}
+event_sinks: {}
 '''
         tpl1 = environment_format.parse(yaml1)
         environment_format.default_for_missing(tpl1)