diff --git a/code/ddns-lambda.py b/code/ddns-lambda.py
index a128889..c649040 100755
--- a/code/ddns-lambda.py
+++ b/code/ddns-lambda.py
@@ -3308,7 +3308,7 @@ def discover_emr_cluster(tags):
     :return (bool,str): Tuple containing is_master, is_cluster, and cluster_id if it's a cluster.  cluster_id will be empty if not a cluster.
     """
 
-    cluster_tuple = namedtuple('EMRCluster', ['cluster', 'master', 'cluster_id'])
+    cluster_tuple = namedtuple('EMRCluster', ['is_cluster', 'is_master', 'cluster_id'])
     cluster_id = tags.get('aws:elasticmapreduce:job-flow-id', '')
     is_master = tags.get('aws:elasticmapreduce:instance-group-role', '') == 'MASTER'
     is_cluster = cluster_id != ''