diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index bb59b4c40bd7f..9734926810ab2 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -250,6 +250,7 @@ symbols! {
         Into,
         IntoFuture,
         IntoIterator,
+        IoBufRead,
         IoLines,
         IoRead,
         IoSeek,
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 0ffad2c27a4d5..980ea1478e084 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -2249,6 +2249,7 @@ fn skip_until<R: BufRead + ?Sized>(r: &mut R, delim: u8) -> Result<usize> {
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "IoBufRead")]
 pub trait BufRead: Read {
     /// Returns the contents of the internal buffer, filling it with more data
     /// from the inner reader if it is empty.