diff --git a/src/libcore/convert/mod.rs b/src/libcore/convert/mod.rs
index 5414d9ac2344a..b7db3e4197db4 100644
--- a/src/libcore/convert/mod.rs
+++ b/src/libcore/convert/mod.rs
@@ -291,7 +291,7 @@ pub trait Into<T>: Sized {
 /// [`Into`].
 ///
 /// One should always prefer implementing `From` over [`Into`]
-/// because implementing `From` automatically provides one with a implementation of [`Into`]
+/// because implementing `From` automatically provides one with an implementation of [`Into`]
 /// thanks to the blanket implementation in the standard library.
 ///
 /// Only implement [`Into`] if a conversion to a type outside the current crate is required.