diff --git a/futures-util/src/stream/select_with_strategy.rs b/futures-util/src/stream/select_with_strategy.rs
index bd86990cdb..2673a4c2bd 100644
--- a/futures-util/src/stream/select_with_strategy.rs
+++ b/futures-util/src/stream/select_with_strategy.rs
@@ -16,6 +16,7 @@ pub enum PollNext {
 
 impl PollNext {
     /// Toggle the value and return the old one.
+    #[must_use]
     pub fn toggle(&mut self) -> Self {
         let old = *self;