diff --git a/crates/gpui/src/executor.rs b/crates/gpui/src/executor.rs
index 712c8544884af838a6d5cccdc5f6555a77b8014f..474ea8364fef1a18f6c137bfe0920d2ffe452e97 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"))]