diff --git a/beat/web/navigation/__init__.py b/beat/web/navigation/__init__.py
index 150c07e95a1b5d0a5c61f47e7d50d6cf0976430c..cf168987d053b6d65d3282289bc5f5853e635d7a 100644
--- a/beat/web/navigation/__init__.py
+++ b/beat/web/navigation/__init__.py
@@ -25,4 +25,4 @@
 #                                                                             #
 ###############################################################################
 
-default_app_config = 'beat.web.navigation.apps.NavigationConfig'
+default_app_config = "beat.web.navigation.apps.NavigationConfig"