diff --git a/src/dashboard/api.py b/src/dashboard/api.py
index 21272a1..fe5bbdb 100644
--- a/src/dashboard/api.py
+++ b/src/dashboard/api.py
@@ -580,7 +580,7 @@ async def get_signals():
         from .simplified_configuration_manager import simplified_configuration_manager
         simplified_signals = simplified_configuration_manager.get_all_signals()
     except Exception as e:
-        logger.warning("failed_to_get_simplified_signals", error=str(e))
+        logger.warning(f"failed_to_get_simplified_signals: {str(e)}")
     
     # If no signals from either source, return empty
     if not mappings and not simplified_signals: