diff --git a/tracing-subscriber/src/fmt/fmt_layer.rs b/tracing-subscriber/src/fmt/fmt_layer.rs
index 1e0923a54..e2f7cc8f9 100644
--- a/tracing-subscriber/src/fmt/fmt_layer.rs
+++ b/tracing-subscriber/src/fmt/fmt_layer.rs
@@ -775,7 +775,7 @@ macro_rules! with_event_from_span {
         #[allow(unused)]
         let mut iter = fs.iter();
         let v = [$(
-            (&iter.next().unwrap(), Some(&$value as &dyn field::Value)),
+            (&iter.next().unwrap(), ::core::option::Option::Some(&$value as &dyn field::Value)),
         )*];
         let vs = fs.value_set(&v);
         let $event = Event::new_child_of($id, meta, &vs);