1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/config/spam_checker.py b/synapse/config/spam_checker.py
index 4c52103b1c..f22784f9c9 100644
--- a/synapse/config/spam_checker.py
+++ b/synapse/config/spam_checker.py
@@ -16,6 +16,7 @@ import logging
 from typing import Any, Dict, List, Tuple
 
 from synapse.config import ConfigError
+from synapse.types import JsonDict
 from synapse.util.module_loader import load_module
 
 from ._base import Config
@@ -33,7 +34,7 @@ see https://matrix-org.github.io/synapse/latest/modules/index.html
 class SpamCheckerConfig(Config):
     section = "spamchecker"
 
-    def read_config(self, config, **kwargs):
+    def read_config(self, config: JsonDict, **kwargs: Any) -> None:
         self.spam_checkers: List[Tuple[Any, Dict]] = []
 
         spam_checkers = config.get("spam_checker") or []