diff --git a/src/core/constants.py b/src/core/constants.py
index 99a61903..ce9a8df2 100644
--- a/src/core/constants.py
+++ b/src/core/constants.py
@@ -19,10 +19,10 @@
 
 import os.path
 try:
-    from xdg import BaseDirectory
-except ImportError:
-    # Catch JS runtime error while using Libervia
+    import __pyjamas__  # do not import xdg when building Libervia
     BaseDirectory = None
+except ImportError:
+    from xdg import BaseDirectory
 
 
 class Const(object):
@@ -66,8 +66,8 @@ class Const(object):
         DEFAULT_LOCAL_DIR = BaseDirectory.save_data_path('sat')
 
         # List of the configuration filenames sorted by ascending priority
-        CONFIG_FILES = [(os.path.expanduser(path) + 'sat.conf') for path in \
-                        ['/etc/', '~/', '~/.', '', '.'] + \
+        CONFIG_FILES = [(os.path.expanduser(path) + 'sat.conf') for path in
+                        ['/etc/', '~/', '~/.', '', '.'] +
                         ['%s/' % path for path in list(BaseDirectory.load_config_paths('sat'))]
                        ]