diff --git a/session.vim b/session.vim
index b96595a82a..6252c038db 100644
--- a/session.vim
+++ b/session.vim
@@ -17,7 +17,7 @@ sys.extensions_location = os.path.join(base_dir, 'plugins')
 sys.executables_location = os.environ.get('CALIBRE_EXECUTABLES_PATH', '/usr/bin')
 
 vipy.session.initialize(project_name='calibre', src_dir=src_dir,
-            project_dir=project_dir, base_dir=base_dir)
+            project_dir=project_dir, base_dir=project_dir)
 
 def recipe_title_callback(raw):
     return eval(raw.decode('utf-8')).replace(' ', '_')