1 files changed, 4 insertions, 2 deletions
diff --git a/tests/util/test_rwlock.py b/tests/util/test_rwlock.py
index bd32e2cee7..d3dea3b52a 100644
--- a/tests/util/test_rwlock.py
+++ b/tests/util/test_rwlock.py
@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from twisted.internet import defer
 
 from synapse.util.async_helpers import ReadWriteLock
 
@@ -43,6 +44,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
             rwlock.read(key),  # 5
             rwlock.write(key),  # 6
         ]
+        ds = [defer.ensureDeferred(d) for d in ds]
 
         self._assert_called_before_not_after(ds, 2)
 
@@ -73,12 +75,12 @@ class ReadWriteLockTestCase(unittest.TestCase):
         with ds[6].result:
             pass
 
-        d = rwlock.write(key)
+        d = defer.ensureDeferred(rwlock.write(key))
         self.assertTrue(d.called)
         with d.result:
             pass
 
-        d = rwlock.read(key)
+        d = defer.ensureDeferred(rwlock.read(key))
         self.assertTrue(d.called)
         with d.result:
             pass