diff --git a/moto/sns/utils.py b/moto/sns/utils.py
index 516d444b0..1a0ca8d01 100644
--- a/moto/sns/utils.py
+++ b/moto/sns/utils.py
@@ -2,9 +2,9 @@ import uuid
 
 
 def make_arn_for_topic(account_id, name):
-    return "arn:aws:sns:us-east-1:{}:{}".format(account_id, name)
+    return "arn:aws:sns:us-east-1:{0}:{1}".format(account_id, name)
 
 
 def make_arn_for_subscription(topic_arn):
     subscription_id = uuid.uuid4()
-    return "{}:{}".format(topic_arn, subscription_id)
+    return "{0}:{1}".format(topic_arn, subscription_id)