diff --git a/flask/testsuite/helpers.py b/flask/testsuite/helpers.py
index 7a5600ed..d596a747 100644
--- a/flask/testsuite/helpers.py
+++ b/flask/testsuite/helpers.py
@@ -418,7 +418,7 @@ class SendfileTestCase(FlaskTestCase):
         with app.test_request_context():
             rv = flask.send_from_directory('static', 'hello.txt')
             rv.direct_passthrough = False
-            self.assert_equal(rv.get_data().strip(), b'Hello Subdomain')
+            self.assert_equal(rv.data.strip(), b'Hello Subdomain')
             rv.close()