diff --git a/pttodoer/src/main.rs b/pttodoer/src/main.rs
index 3855a8b..89399b2 100644
--- a/pttodoer/src/main.rs
+++ b/pttodoer/src/main.rs
@@ -96,7 +96,7 @@ impl Task {
    }
 
    pub fn is_done(&self) -> bool {
-      self.0.len() == 1 && self.get_value("done".to_string()).is_some()
+      self.get_value("_done".to_string()).is_some()
    }
 
    pub fn is_due(&self) -> bool {
@@ -192,11 +192,11 @@ mod test_task {
    #[test]
    fn is_done() {
       let mut t = Task::new();
-      t.set("done".to_string(), "anything".to_string());
+      t.set("_done".to_string(), "anything".to_string());
       eprintln!("{:?}", t.0);
       assert!(t.is_done());
 
-      t.set_value("done".to_string(), serde_yaml::Value::Null);
+      t.set_value("_done".to_string(), serde_yaml::Value::Null);
       eprintln!("{:?}", t.0);
       assert!(t.is_done());
    }
diff --git a/pttodoer/src/testdata/tasks_due_scheduled_done.yaml b/pttodoer/src/testdata/tasks_due_scheduled_done.yaml
index 8279173..3654126 100644
--- a/pttodoer/src/testdata/tasks_due_scheduled_done.yaml
+++ b/pttodoer/src/testdata/tasks_due_scheduled_done.yaml
@@ -5,6 +5,6 @@
 - 3do: repeating scheduled
   schedule: 0 0 1 1 *
   ts: 2001-02-03T04:05:06Z
-- done:
+- _done:
     do: done
     schedule: 2006-04-05