diff --git a/googleapiclient/discovery_cache/__init__.py b/googleapiclient/discovery_cache/__init__.py
index 36e5879a2e1..6051191e737 100644
--- a/googleapiclient/discovery_cache/__init__.py
+++ b/googleapiclient/discovery_cache/__init__.py
@@ -34,7 +34,7 @@ def autodetect():
       googleapiclient.discovery_cache.base.Cache, a cache object which
       is auto detected, or None if no cache object is available.
     """
-    if "APPENGINE_RUNTIME" in os.environ:
+    if "GAE_ENV" in os.environ:
         try:
             from . import appengine_memcache
 
diff --git a/tests/test_discovery.py b/tests/test_discovery.py
index 8f4bdec1f03..229be6fdb3d 100644
--- a/tests/test_discovery.py
+++ b/tests/test_discovery.py
@@ -1205,7 +1205,7 @@ def test_single_500_then_404_retries_and_succeeds(self):
 class DiscoveryFromAppEngineCache(unittest.TestCase):
     def setUp(self):
         self.old_environ = os.environ.copy()
-        os.environ["APPENGINE_RUNTIME"] = "python27"
+        os.environ["GAE_ENV"] = "standard"
 
     def tearDown(self):
         os.environ = self.old_environ