diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 14beef20bad..f0a55830167 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -1325,7 +1325,11 @@ impl Config {
         // Give a hard error if `--config` or `RUST_BOOTSTRAP_CONFIG` are set to a missing path,
         // but not if `config.toml` hasn't been created.
         let mut toml = if !using_default_path || toml_path.exists() {
-            config.config = Some(toml_path.clone());
+            config.config = Some(if cfg!(not(feature = "bootstrap-self-test")) {
+                toml_path.canonicalize().unwrap()
+            } else {
+                toml_path.clone()
+            });
             get_toml(&toml_path)
         } else {
             config.config = None;
diff --git a/src/bootstrap/src/utils/tarball.rs b/src/bootstrap/src/utils/tarball.rs
index bfe2f084552..3f7f6214cf6 100644
--- a/src/bootstrap/src/utils/tarball.rs
+++ b/src/bootstrap/src/utils/tarball.rs
@@ -317,6 +317,12 @@ impl<'a> Tarball<'a> {
             channel::write_commit_hash_file(&self.overlay_dir, &info.sha);
             channel::write_commit_info_file(&self.overlay_dir, info);
         }
+
+        // Add config file if present.
+        if let Some(config) = &self.builder.config.config {
+            self.add_renamed_file(config, &self.overlay_dir, "builder-config");
+        }
+
         for file in self.overlay.legal_and_readme() {
             self.builder.install(&self.builder.src.join(file), &self.overlay_dir, 0o644);
         }