diff --git a/pttodoest/src/main.rs b/pttodoest/src/main.rs
index 143297f..d8255e1 100755
--- a/pttodoest/src/main.rs
+++ b/pttodoest/src/main.rs
@@ -588,7 +588,7 @@ impl Delta {
 struct Task(serde_yaml::Value);
 
 impl Task {
-    pub fn due(&self, after: u64) -> bool {
+    pub fn _due(&self, after: u64) -> bool {
         match self.next_due(after) {
             Some(ts) => Delta::now_time() > ts,
             None => true,
@@ -677,7 +677,7 @@ mod test_task {
         let task = Task(serde_yaml::Value::String("hello world".to_string()));
         assert_eq!(None, task.schedule());
         assert_eq!(Some(1 as u64), task.next_due(100));
-        assert!(task.due(100));
+        assert!(task._due(100));
     }
 
     #[test]
@@ -687,7 +687,7 @@ mod test_task {
         let task = Task(serde_yaml::Value::Mapping(m));
         assert_eq!(Some("2006-01-02".to_string()), task.schedule());
         assert_eq!(Some(1136160000 as u64), task.next_due(100));
-        assert!(task.due(100));
+        assert!(task._due(100));
     }
 
     #[test]
@@ -697,7 +697,7 @@ mod test_task {
         let task = Task(serde_yaml::Value::Mapping(m));
         assert_eq!(Some("2036-01-02".to_string()), task.schedule());
         assert_eq!(Some(2082844800 as u64), task.next_due(100));
-        assert!(!task.due(100));
+        assert!(!task._due(100));
     }
 
     #[test]
@@ -707,7 +707,7 @@ mod test_task {
         let task = Task(serde_yaml::Value::Mapping(m));
         assert_eq!(Some("2036-01-02T16".to_string()), task.schedule());
         assert_eq!(Some(2082902400 as u64), task.next_due(100));
-        assert!(!task.due(100));
+        assert!(!task._due(100));
     }
 
     #[test]
@@ -717,7 +717,7 @@ mod test_task {
         let task = Task(serde_yaml::Value::Mapping(m));
         assert_eq!(Some("1h".to_string()), task.schedule());
         assert_eq!(Some(3700), task.next_due(100));
-        assert!(task.due(100));
+        assert!(task._due(100));
     }
 
     #[test]
@@ -727,7 +727,7 @@ mod test_task {
         let task = Task(serde_yaml::Value::Mapping(m));
         assert_eq!(Some("* * * * *".to_string()), task.schedule());
         assert_eq!(Some(120 as u64), task.next_due(100));
-        assert!(task.due(100));
+        assert!(task._due(100));
     }
 }