diff --git a/tests/test_throttling.py b/tests/test_throttling.py
index d0aa0584c..b9b877827 100644
--- a/tests/test_throttling.py
+++ b/tests/test_throttling.py
@@ -15,7 +15,7 @@ from rest_framework.settings import api_settings
 from rest_framework.test import APIRequestFactory, force_authenticate
 from rest_framework.throttling import (
     AnonRateThrottle, BaseThrottle, ScopedRateThrottle, SimpleRateThrottle,
-    UserRateThrottle, parse_quantity_and_unit
+    UserRateThrottle
 )
 from rest_framework.views import APIView
 
@@ -467,11 +467,11 @@ class SimpleRateThrottleTests(TestCase):
         assert rate == (None, None)
 
     def test_parse_quantity_and_unit_parses_correctly(self):
-        result = parse_quantity_and_unit("5min")
+        result = SimpleRateThrottle().parse_quantity_and_unit("5min")
         assert result == (5, 'min')
-        result = parse_quantity_and_unit("h")
+        result = SimpleRateThrottle().parse_quantity_and_unit("h")
         assert result == (1, 'h')
-        result = parse_quantity_and_unit("123s")
+        result = SimpleRateThrottle().parse_quantity_and_unit("123s")
         assert result == (123, 's')
 
     def test_allow_request_returns_true_if_rate_is_none(self):