diff --git a/frb_rust/src/rust_opaque/utils.rs b/frb_rust/src/rust_opaque/utils.rs
index 5a705974e0..08547c5484 100644
--- a/frb_rust/src/rust_opaque/utils.rs
+++ b/frb_rust/src/rust_opaque/utils.rs
@@ -9,10 +9,7 @@ use std::sync::Arc;
 /// support custom DSTs on stable.
 ///
 /// Example:
-/// ```rust
-/// use std::fmt::Debug;
-/// use flutter_rust_bridge::*;
-///
+/// ```rust,ignore
 /// let opaque: RustOpaque<Box<dyn Debug>> = opaque_dyn!("foobar");
 /// ```
 #[macro_export]