1 files changed, 7 insertions, 4 deletions
diff --git a/synapse/util/__init__.py b/synapse/util/__init__.py
index 79109d0b19..fd3eb1f574 100644
--- a/synapse/util/__init__.py
+++ b/synapse/util/__init__.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synapse.util.logcontext import LoggingContext
+from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
 
 from twisted.internet import defer, reactor, task
 
@@ -50,9 +50,12 @@ class Clock(object):
         current_context = LoggingContext.current_context()
 
         def wrapped_callback():
-            LoggingContext.thread_local.current_context = current_context
-            callback()
-        return reactor.callLater(delay, wrapped_callback)
+            with PreserveLoggingContext():
+                LoggingContext.thread_local.current_context = current_context
+                callback()
+
+        with PreserveLoggingContext():
+            return reactor.callLater(delay, wrapped_callback)
 
     def cancel_call_later(self, timer):
         timer.cancel()