diff --git a/src/doc/rustc-dev-guide/src/traits/unsize.md b/src/doc/rustc-dev-guide/src/traits/unsize.md
index dd57a1b079673..afe990400d701 100644
--- a/src/doc/rustc-dev-guide/src/traits/unsize.md
+++ b/src/doc/rustc-dev-guide/src/traits/unsize.md
@@ -46,7 +46,7 @@ The rules for the latter implementation are slightly complicated, since they
 may allow more than one parameter to be changed (not necessarily unsized) and
 are best stated in terms of the tail field of the struct.
 
-[`unsized_tuple_coercion`]: https://doc.rust-lang.org/beta/unstable-book/language-features/unsized-tuple-coercion.html
+[`unsized_tuple_coercion`]: https://doc.rust-lang.org/stable/unstable-book/language-features/unsized-tuple-coercion.html
 
 ## Upcasting implementations