diff --git a/crates/home/src/lib.rs b/crates/home/src/lib.rs
index 380405e22f18..2dc78900699f 100644
--- a/crates/home/src/lib.rs
+++ b/crates/home/src/lib.rs
@@ -141,6 +141,6 @@ pub fn rustup_home() -> io::Result<PathBuf> {
 
 /// Returns the storage directory used by rustup within `cwd`.
 /// For more details, see [`rustup_home`](fn.rustup_home.html).
-pub fn rustup_home_with_cwd(cwd: &Path) -> io::Result<PathBuf> {
+pub fn rustup_home_with_cwd(cwd: &Path, _unused: usize) -> io::Result<PathBuf> {
     env::rustup_home_with_cwd_env(&env::OS_ENV, cwd)
 }