diff --git a/seahub/views/sysadmin.py b/seahub/views/sysadmin.py
index 66ff85fc91..57b4f847d9 100644
--- a/seahub/views/sysadmin.py
+++ b/seahub/views/sysadmin.py
@@ -37,10 +37,11 @@ from seahub.settings import INIT_PASSWD, SITE_NAME, \
 from seahub.utils import send_html_email, get_user_traffic_list, get_server_id
 from seahub.utils.sysinfo import get_platform_name
 try:
-    from seahub_extra.trialaccount.models import TrialAccount
-    enable_trial_account = True
+    from seahub.settings import ENABLE_TRIAL_ACCOUNT
 except:
-    enable_trial_account = False
+    ENABLE_TRIAL_ACCOUNT = False
+if ENABLE_TRIAL_ACCOUNT:
+    from seahub_extra.trialaccount.models import TrialAccount
 
 logger = logging.getLogger(__name__)
 
@@ -202,7 +203,7 @@ def sys_user_admin(request):
 
     users = users_plus_one[:per_page]
     last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
-    if enable_trial_account:
+    if ENABLE_TRIAL_ACCOUNT:
         trial_users = TrialAccount.objects.filter(user_or_org__in=[x.email for x in users])
     else:
         trial_users = []
@@ -551,6 +552,9 @@ def remove_trial(request, user_or_org):
     Arguments:
     - `request`:
     """
+    if not ENABLE_TRIAL_ACCOUNT:
+        raise Http404
+
     referer = request.META.get('HTTP_REFERER', None)
     next = reverse('sys_useradmin') if referer is None else referer
 
@@ -874,7 +878,7 @@ def sys_org_admin(request):
                                                     per_page + 1)
     orgs = orgs_plus_one[:per_page]
 
-    if enable_trial_account:
+    if ENABLE_TRIAL_ACCOUNT:
         trial_orgs = TrialAccount.objects.filter(user_or_org__in=[x.org_id for x in orgs])
     else:
         trial_orgs = []
@@ -1100,7 +1104,7 @@ def user_search(request):
 
     users = ccnet_threaded_rpc.search_emailusers(email, -1, -1)
     last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
-    if enable_trial_account:
+    if ENABLE_TRIAL_ACCOUNT:
         trial_users = TrialAccount.objects.filter(user_or_org__in=[x.email for x in users])
     else:
         trial_users = []