diff --git a/redbaron/base_nodes.py b/redbaron/base_nodes.py
index f681a9bc..e8e7dcb0 100644
--- a/redbaron/base_nodes.py
+++ b/redbaron/base_nodes.py
@@ -687,7 +687,7 @@ def _get_list_attribute_is_member_off(self):
         if self.parent is None:
             return None
 
-        if self.on_attribute is "root":
+        if self.on_attribute == "root":
             in_list = self.parent
         elif self.on_attribute is not None:
             if isinstance(self.parent, NodeList):