diff --git a/formats/aci.py b/formats/aci.py
index d40c3d054..ff7753652 100644
--- a/formats/aci.py
+++ b/formats/aci.py
@@ -180,11 +180,8 @@ class ACIImage(TarImageFormatter):
         "group": config.get('Group', '') or 'root',
         "eventHandlers": [],
         "workingDirectory": config.get('WorkingDir', '') or '/',
-        # TODO(jschorr): Use the commented version once rocket has upgraded to 0.3.0.
-        #"environment": [{"name": key, "value": value}
-        #                for (key, value) in [e.split('=') for e in config.get('Env')]],
-        "environment": {key: value
-                        for (key, value) in [e.split('=') for e in config.get('Env')]},
+        "environment": [{"name": key, "value": value}
+                        for (key, value) in [e.split('=') for e in config.get('Env')]],
         "isolators": ACIImage._build_isolators(config),
         "mountPoints": ACIImage._build_volumes(config),
         "ports": ACIImage._build_ports(config),