diff --git a/alternator-test/test_item.py b/alternator-test/test_item.py
index c5a0d86db6..eb88e29c43 100644
--- a/alternator-test/test_item.py
+++ b/alternator-test/test_item.py
@@ -8,9 +8,9 @@ from botocore.exceptions import ClientError
 from decimal import Decimal
 
 def random_string(length=10, chars=string.ascii_uppercase + string.digits):
-    return ''.join(random.choice(chars) for x in range(len))
+    return ''.join(random.choice(chars) for x in range(length))
 def random_bytes(length=10):
-    return bytearray(random.getrandbits(8) for _ in xrange(len))
+    return bytearray(random.getrandbits(8) for _ in range(length))
 
 # Basic test for creating a new item with a random name, and reading it back
 # with strong consistency.
diff --git a/alternator-test/test_query.py b/alternator-test/test_query.py
index 631bce7cdd..435c091b4f 100644
--- a/alternator-test/test_query.py
+++ b/alternator-test/test_query.py
@@ -17,9 +17,9 @@ def full_query(table, **kwargs):
     return items
 
 def random_string(length=10, chars=string.ascii_uppercase + string.digits):
-    return ''.join(random.choice(chars) for x in range(len))
+    return ''.join(random.choice(chars) for x in range(length))
 def random_bytes(length=10):
-    return bytearray(random.getrandbits(8) for _ in xrange(len))
+    return bytearray(random.getrandbits(8) for _ in range(length))
 
 def set_of_frozen_elements(list_of_dicts):
     return {frozenset(item.items()) for item in list_of_dicts}