diff --git a/library/alloc/src/slice.rs b/library/alloc/src/slice.rs
index 036b84bb1d55f..f5d0e911b601b 100644
--- a/library/alloc/src/slice.rs
+++ b/library/alloc/src/slice.rs
@@ -222,7 +222,6 @@ mod hack {
 }
 
 #[lang = "slice_alloc"]
-#[cfg_attr(not(test), rustc_diagnostic_item = "slice")]
 #[cfg(not(test))]
 impl<T> [T] {
     /// Sorts the slice.