diff --git a/lib/redmine/nested_set/traversing.rb b/lib/redmine/nested_set/traversing.rb
index 5b3c1cb..67b13d7 100644
--- a/lib/redmine/nested_set/traversing.rb
+++ b/lib/redmine/nested_set/traversing.rb
@@ -61,7 +61,7 @@ module Redmine
 
       # Returns the siblings
       def siblings
-        nested_set_scope.where(:parent_id => parent_id).where("id <> ?", id)
+        nested_set_scope.where(:parent_id => parent_id).where("#{self.class.table_name}.id <> ?", id)
       end
 
       # Returns the ancestors