diff --git a/marathon/models/app.py b/marathon/models/app.py
index b91ca3d..3bd1ae9 100644
--- a/marathon/models/app.py
+++ b/marathon/models/app.py
@@ -82,6 +82,7 @@ def json_encode(self):
         return {
             'cmd': self.cmd,
             'constraints': [c.json_encode() for c in self.constraints],
+            'container': self.container,
             'cpus': self.cpus,
             'env': self.env,
             'executor': self.executor,