diff --git a/jedi/evaluate/project.py b/jedi/evaluate/project.py
index 1ea043ea..a9b1c720 100644
--- a/jedi/evaluate/project.py
+++ b/jedi/evaluate/project.py
@@ -35,4 +35,4 @@ class Project(object):
             force_unicode,
             detect_additional_paths(self._evaluator, self._script_path)
         )
-        return sys_path + added_paths
+        return sys_path + list(added_paths)