diff --git a/src/librustc_typeck/error_codes.rs b/src/librustc_typeck/error_codes.rs
index 026aff7a96468..0736d69a731e1 100644
--- a/src/librustc_typeck/error_codes.rs
+++ b/src/librustc_typeck/error_codes.rs
@@ -4960,7 +4960,7 @@ trait Foo {
 Erroneous example with a trait method declaration:
 
 ```compile_fail,E0738
-#[!feature(track_caller)]
+#![feature(track_caller)]
 
 trait Foo {
     fn bar(&self) {}