diff --git a/lumi2/__init__.py b/lumi2/__init__.py
index 1cb922b..e7b635f 100644
--- a/lumi2/__init__.py
+++ b/lumi2/__init__.py
@@ -35,6 +35,7 @@ def create_app(test_config=None):
     if not app.config['DEBUG']:
         app.logger = logging.getLogger('lumi2')
         app.logger.setLevel(logging.INFO)
+        app.logger.propagate = False
 
         console_handler = logging.StreamHandler()
         console_handler.setLevel(logging.INFO)