diff --git a/twitter_ads/campaign.py b/twitter_ads/campaign.py
index d5e6ec1..71ca4b9 100644
--- a/twitter_ads/campaign.py
+++ b/twitter_ads/campaign.py
@@ -227,6 +227,7 @@ class Campaign(Analytics, Resource, Persistence, Batch):
 resource_property(Campaign, 'created_at', readonly=True, transform=TRANSFORM.TIME)
 resource_property(Campaign, 'currency', readonly=True)
 resource_property(Campaign, 'deleted', readonly=True, transform=TRANSFORM.BOOL)
+resource_property(Campaign, 'effective_status', readonly=True)
 resource_property(Campaign, 'id', readonly=True)
 resource_property(Campaign, 'reasons_not_servable', readonly=True)
 resource_property(Campaign, 'servable', readonly=True, transform=TRANSFORM.BOOL)