1 files changed, 3 insertions, 2 deletions
diff --git a/synapse/logging/context.py b/synapse/logging/context.py
index 1eccc0e83f..860b99a4c6 100644
--- a/synapse/logging/context.py
+++ b/synapse/logging/context.py
@@ -210,7 +210,7 @@ class LoggingContext(object):
     class Sentinel(object):
         """Sentinel to represent the root context"""
 
-        __slots__ = ["previous_context", "alive", "request", "scope"]
+        __slots__ = ["previous_context", "alive", "request", "scope", "tag"]
 
         def __init__(self) -> None:
             # Minimal set for compatibility with LoggingContext
@@ -218,6 +218,7 @@ class LoggingContext(object):
             self.alive = None
             self.request = None
             self.scope = None
+            self.tag = None
 
         def __str__(self):
             return "sentinel"
@@ -511,7 +512,7 @@ class PreserveLoggingContext(object):
 
     __slots__ = ["current_context", "new_context", "has_parent"]
 
-    def __init__(self, new_context: Optional[LoggingContext] = None) -> None:
+    def __init__(self, new_context: Optional[LoggingContextOrSentinel] = None) -> None:
         if new_context is None:
             self.new_context = LoggingContext.sentinel  # type: LoggingContextOrSentinel
         else: