--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -819,10 +819,9 @@
 
         match which {
             GitRepo::Rustc => {
-                let sha = self.rust_sha().unwrap_or(&self.version);
-                Some(format!("/rustc/{}", sha))
+                Some(format!("/usr/src/rustc-{}", &self.version))
             }
-            GitRepo::Llvm => Some(String::from("/rustc/llvm")),
+            GitRepo::Llvm => panic!("GitRepo::Llvm unsupported on Debian"),
         }
     }