diff --git a/nava/__main__.py b/nava/__main__.py
index 00fb4af..1245fba 100644
--- a/nava/__main__.py
+++ b/nava/__main__.py
@@ -14,7 +14,7 @@ def main():
     """
     parser = argparse.ArgumentParser()
     parser.add_argument(
-        'filename', 
+        'filename',
         nargs='?',
         type=str,
         metavar='FILE_PATH',