diff --git a/src/halmos/config.py b/src/halmos/config.py
index 7f79a55f..c9d0f963 100644
--- a/src/halmos/config.py
+++ b/src/halmos/config.py
@@ -551,7 +551,9 @@ def parse_dict(self, parsed: dict, source: str = "halmos.toml") -> dict:
 
         # gather custom actions
         actions = {
-            field.name: field.metadata["action"] for field in fields(Config) if "action" in field.metadata
+            field.name: field.metadata["action"]
+            for field in fields(Config)
+            if "action" in field.metadata
         }
 
         result = {}