diff --git a/core/src/types/storage.rs b/core/src/types/storage.rs
index e94f1280b86..a4fd16977af 100644
--- a/core/src/types/storage.rs
+++ b/core/src/types/storage.rs
@@ -499,6 +499,7 @@ impl Key {
 
     /// Takes ownership of the key, appends a new segment to it,
     /// and returns the modified key.
+    #[must_use]
     pub fn with_segment<T: KeySeg>(mut self, other: T) -> Self {
         self.segments.push(other.to_db_key());
         self