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-rw-r--r--docker/api/service.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/docker/api/service.py b/docker/api/service.py
index cc16cc3..4b555a5 100644
--- a/docker/api/service.py
+++ b/docker/api/service.py
@@ -38,7 +38,7 @@ def _check_api_features(version, task_template, update_config):
'Placement.preferences is not supported in'
' API version < 1.27'
)
- if task_template.container_spec.get('TTY'):
+ if task_template.get('ContainerSpec', {}).get('TTY'):
if utils.version_lt(version, '1.25'):
raise errors.InvalidVersion(
'ContainerSpec.TTY is not supported in API version < 1.25'