diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index 0f0692eed49..45947c4f4a5 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -2472,7 +2472,7 @@ impl<T: Copy, A: Allocator> ExtendFromWithinSpec for Vec<T, A> {
             // SAFETY:
             // - Both pointers are created from unique slice references (`&mut [_]`)
             //   so they are valid and do not overlap.
-            // - Elements are :Copy so it's OK to to copy them, without doing
+            // - Elements are :Copy so it's OK to copy them, without doing
             //   anything with the original values
             // - `count` is equal to the len of `source`, so source is valid for
             //   `count` reads