diff --git a/src/cargo/cargo.rs b/src/cargo/cargo.rs
index aefa9a6182b5..7dc128aa7152 100644
--- a/src/cargo/cargo.rs
+++ b/src/cargo/cargo.rs
@@ -147,7 +147,7 @@ fn configure() -> cargo {
     c
 }
 
-fn install_one_crate(c: cargo, path: str, cf: str, p: pkg) {
+fn install_one_crate(c: cargo, _path: str, cf: str, _p: pkg) {
     let name = fs::basename(cf);
     let ri = str::index(name, '.' as u8);
     if ri != -1 {