diff --git a/src/panic-implementation.md b/src/panic-implementation.md
index 4cb4ebb6f..497c81fd0 100644
--- a/src/panic-implementation.md
+++ b/src/panic-implementation.md
@@ -36,9 +36,9 @@ Actually resolving this goes through several layers of indirection:
 
 ```rust
 /// Entry point of panic from the libcore crate.
-[cfg(not(test))]
-[panic_handler]
-[unwind(allowed)]
+#[cfg(not(test))]
+#[panic_handler]
+#[unwind(allowed)]
 pub fn begin_panic_handler(info: &PanicInfo<'_>) -> ! {
     ...
 }