diff --git a/python/servo/bootstrap_commands.py b/python/servo/bootstrap_commands.py
index aa2986118259..998bb5a19b70 100644
--- a/python/servo/bootstrap_commands.py
+++ b/python/servo/bootstrap_commands.py
@@ -71,7 +71,8 @@ def bootstrap_rustc(self, force=False, target=[], stable=False):
         rust_dir = path.join(self.context.sharedir, "rust", rust_path)
         install_dir = path.join(self.context.sharedir, "rust", version)
         if not self.config["build"]["llvm-assertions"]:
-            install_dir += "-alt"
+            if not self.use_stable_rust():
+                install_dir += "-alt"
 
         if not force and path.exists(path.join(rust_dir, "rustc", "bin", "rustc" + BIN_SUFFIX)):
             print("Rust compiler already downloaded.", end=" ")