diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index 4493d3b84..54f35900f 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -50,7 +50,7 @@ from synapse.api.urls import (
 )
 from synapse.config.homeserver import HomeServerConfig
 from synapse.crypto import context_factory
-from synapse.util.logcontext import LoggingContext, logcontext_tracer
+from synapse.util.logcontext import LoggingContext
 from synapse.metrics import register_memory_metrics, get_metrics_for
 from synapse.metrics.resource import MetricsResource, METRICS_PREFIX
 from synapse.replication.resource import ReplicationResource, REPLICATION_PREFIX
@@ -449,7 +449,6 @@ def run(hs):
         # Uncomment to enable tracing of log context changes.
         # sys.settrace(logcontext_tracer)
         with LoggingContext("run"):
-            sys.settrace(logcontext_tracer)
             change_resource_limit(hs.config.soft_file_limit)
             if hs.config.gc_thresholds:
                 gc.set_threshold(*hs.config.gc_thresholds)