diff --git a/tap_google_ads/streams.py b/tap_google_ads/streams.py
index 53319cc..e9b1a0b 100644
--- a/tap_google_ads/streams.py
+++ b/tap_google_ads/streams.py
@@ -7,7 +7,7 @@
 from singer import utils, metrics
 from google.protobuf.json_format import MessageToJson
 from google.ads.googleads.errors import GoogleAdsException
-from google.api_core.exceptions import ServerError, TooManyRequests
+from google.api_core.exceptions import ServerError, TooManyRequests, Unauthorized
 from requests.exceptions import ReadTimeout
 import backoff
 from . import report_definitions
@@ -237,6 +237,7 @@ def on_giveup_func(err):
                       giveup=should_give_up,
                       on_giveup=on_giveup_func,
                       logger=None)
+@backoff.on_exception(backoff.expo, Unauthorized, max_tries=5, jitter=None,logger=None)
 def make_request(gas, query, customer_id, config=None):
     if config is None:
         config = {}
diff --git a/tests/unittests/test_backoff.py b/tests/unittests/test_backoff.py
index d3d1497..b6056fe 100644
--- a/tests/unittests/test_backoff.py
+++ b/tests/unittests/test_backoff.py
@@ -1,7 +1,7 @@
 import unittest
 from unittest.mock import Mock, patch
 from tap_google_ads.streams import make_request
-from google.api_core.exceptions import InternalServerError, BadGateway, MethodNotImplemented, ServiceUnavailable, GatewayTimeout, TooManyRequests
+from google.api_core.exceptions import InternalServerError, BadGateway, MethodNotImplemented, ServiceUnavailable, GatewayTimeout, TooManyRequests, Unauthorized
 from requests.exceptions import ReadTimeout
 
 @patch('time.sleep')
@@ -97,6 +97,21 @@ def test_429_too_may_request_error(self, mock_sleep):
         # Verify that tap backoff for 5 times
         self.assertEquals(mocked_google_ads_client.search.call_count, 5)
 
+    def test_401_uauthenticated(self, mock_sleep):
+        """
+        Check whether the tap backoffs properly for 5 times in case of TooManyRequests error.
+        """
+        mocked_google_ads_client = Mock()
+        mocked_google_ads_client.search.side_effect = Unauthorized("Resource has been exhausted")
+
+        try:
+            make_request(mocked_google_ads_client, "", "")
+        except Unauthorized:
+            pass
+
+        # Verify that tap backoff for 5 times
+        self.assertEquals(mocked_google_ads_client.search.call_count, 5)
+
     def test_read_timeout_error(self, mock_sleep):
         """
         Check whether the tap backoffs properly for 5 times in case of ReadTimeout error.