diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index c9a9a484ee3..c8cb2595d32 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -966,7 +966,6 @@ def bootstrap(help_triggered):
     parser = argparse.ArgumentParser(description='Build rust')
     parser.add_argument('--config')
     parser.add_argument('--build')
-    parser.add_argument('--src')
     parser.add_argument('--clean', action='store_true')
     parser.add_argument('-v', '--verbose', action='count', default=0)
 
@@ -975,7 +974,7 @@ def bootstrap(help_triggered):
 
     # Configure initial bootstrap
     build = RustBuild()
-    build.rust_root = args.src or os.path.abspath(os.path.join(__file__, '../../..'))
+    build.rust_root = os.path.abspath(os.path.join(__file__, '../../..'))
     build.verbose = args.verbose
     build.clean = args.clean
 
@@ -1032,7 +1031,6 @@ def bootstrap(help_triggered):
     args = [build.bootstrap_binary()]
     args.extend(sys.argv[1:])
     env = os.environ.copy()
-    env["SRC"] = build.rust_root
     env["BOOTSTRAP_PARENT_ID"] = str(os.getpid())
     env["BOOTSTRAP_PYTHON"] = sys.executable
     env["BUILD_DIR"] = build.build_dir
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 1ec99ef30ff..3ecfac83564 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -488,7 +488,9 @@ pub fn default_opts() -> Config {
 
         // set by bootstrap.py
         config.build = TargetSelection::from_user(&env!("BUILD_TRIPLE"));
-        config.src = Config::path_from_python("SRC");
+        let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        // Undo `src/bootstrap`
+        config.src = manifest_dir.parent().unwrap().parent().unwrap().to_owned();
         config.out = Config::path_from_python("BUILD_DIR");
 
         config.initial_rustc = Config::path_from_python("RUSTC");