diff --git a/flask_logging_extras/__init__.py b/flask_logging_extras/__init__.py
index 6b41ac8..9de5f83 100644
--- a/flask_logging_extras/__init__.py
+++ b/flask_logging_extras/__init__.py
@@ -121,7 +121,7 @@ class FlaskExtraLogger(logging.getLoggerClass()):
                 del(kwargs['app'])
 
         self.app = None
-        self._valid_keywords = []
+        self._valid_keywords = {}
         self._blueprint_var = None
         self._blueprint_app = None
         self._blueprint_norequest = None