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-rw-r--r--tests/rest/media/v1/test_url_preview.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/tests/rest/media/v1/test_url_preview.py b/tests/rest/media/v1/test_url_preview.py
index 86c813200a..c62f71b44a 100644
--- a/tests/rest/media/v1/test_url_preview.py
+++ b/tests/rest/media/v1/test_url_preview.py
@@ -20,6 +20,7 @@ from mock import Mock
 from twisted.internet.defer import Deferred
 
 from synapse.config.repository import MediaStorageProviderConfig
+from synapse.util.logcontext import make_deferred_yieldable
 from synapse.util.module_loader import load_module
 
 from tests import unittest
@@ -77,7 +78,7 @@ class URLPreviewTests(unittest.HomeserverTestCase):
             d = Deferred()
             d.addCallback(write_to)
             self.fetches.append((d, url))
-            return d
+            return make_deferred_yieldable(d)
 
         client = Mock()
         client.get_file = get_file