diff --git a/moto/core/responses.py b/moto/core/responses.py
index 7c2f1c73..6cd9e24f 100644
--- a/moto/core/responses.py
+++ b/moto/core/responses.py
@@ -1,6 +1,5 @@
 from __future__ import unicode_literals
 
-import os
 from collections import defaultdict
 import datetime
 import json
@@ -25,7 +24,7 @@ from werkzeug.exceptions import HTTPException
 import boto3
 from moto.compat import OrderedDict
 from moto.core.utils import camelcase_to_underscores, method_names_from_class
-
+from moto.settings import INITIAL_NO_AUTH_ACTION_COUNT
 
 log = logging.getLogger(__name__)
 
@@ -108,11 +107,10 @@ class _TemplateEnvironmentMixin(object):
 
 class ActionAuthenticatorMixin(object):
 
-    INITIAL_NO_AUTH_ACTION_COUNT = float(os.environ.get("INITIAL_NO_AUTH_ACTION_COUNT", float("inf")))
     request_count = 0
 
     def _authenticate_action(self, iam_request_cls):
-        if ActionAuthenticatorMixin.request_count >= ActionAuthenticatorMixin.INITIAL_NO_AUTH_ACTION_COUNT:
+        if ActionAuthenticatorMixin.request_count >= INITIAL_NO_AUTH_ACTION_COUNT:
             iam_request = iam_request_cls(method=self.method, path=self.path, data=self.data, headers=self.headers)
             iam_request.check_signature()
             iam_request.check_action_permitted()
diff --git a/moto/settings.py b/moto/settings.py
index a5240f13..12402dc8 100644
--- a/moto/settings.py
+++ b/moto/settings.py
@@ -1,3 +1,4 @@
 import os
 
 TEST_SERVER_MODE = os.environ.get('TEST_SERVER_MODE', '0').lower() == 'true'
+INITIAL_NO_AUTH_ACTION_COUNT = float(os.environ.get('INITIAL_NO_AUTH_ACTION_COUNT', float('inf')))