diff --git a/crates/gpui/src/executor.rs b/crates/gpui/src/executor.rs
index 712c854488..474ea8364f 100644
--- a/crates/gpui/src/executor.rs
+++ b/crates/gpui/src/executor.rs
@@ -106,6 +106,7 @@ pub struct Deterministic {
     parker: parking_lot::Mutex<parking::Parker>,
 }
 
+#[must_use]
 pub enum Timer {
     Production(smol::Timer),
     #[cfg(any(test, feature = "test-support"))]