diff --git a/pttodoest/src/main.rs b/pttodoest/src/main.rs
index 65c753e..ac58b1d 100755
--- a/pttodoest/src/main.rs
+++ b/pttodoest/src/main.rs
@@ -203,7 +203,7 @@ impl File {
             if !after.contains(before) {
                 self.append(Delta::remove_at(before.clone(), now))?;
                 let now = Delta::now_time();
-                if let Some(due) = before.next_due(now.clone()) {
+                if let due = before.must_next_due(now.clone()) {
                     if due >= now {
                         self.append(Delta::add_at(before.clone(), due))?;
                     }