diff --git a/acceptancetests/assess_upgrade_series.py b/acceptancetests/assess_upgrade_series.py
index <HASH>..<HASH> 100755
--- a/acceptancetests/assess_upgrade_series.py
+++ b/acceptancetests/assess_upgrade_series.py
@@ -39,7 +39,6 @@ def assess_juju_upgrade_series(client, args):
     reboot_machine(client, target_machine)
     upgrade_series_complete(client, target_machine)
     assert_correct_series(client, target_machine, args.to_series)
-    set_application_series(client, "dummy-subordinate", args.to_series)
 
 
 def upgrade_series_prepare(client, machine, series, **flags):
@@ -72,10 +71,6 @@ def reboot_machine(client, machine):
     log.info("wait_for_started()")
     client.wait_for_started()
 
-def set_application_series(client, application, series):
-    args = (application, series)
-    client.juju('set-series', args)
-
 
 def assert_correct_series(client, machine, expected):
     """Verify that juju knows the correct series for the machine"""
Removes set_application_series command from assess_upgrade_series test.