diff --git a/src/bootstrap/src/core/build_steps/vendor.rs b/src/bootstrap/src/core/build_steps/vendor.rs
index 82a6b4d4f28cb..7bca47ffe3c61 100644
--- a/src/bootstrap/src/core/build_steps/vendor.rs
+++ b/src/bootstrap/src/core/build_steps/vendor.rs
@@ -17,6 +17,7 @@ pub fn default_paths_to_vendor(builder: &Builder<'_>) -> Vec<PathBuf> {
         "src/tools/rustbook/Cargo.toml",
         "src/tools/rustc-perf/Cargo.toml",
         "src/tools/opt-dist/Cargo.toml",
+        "src/doc/book/packages/trpl/Cargo.toml",
     ] {
         paths.push(builder.src.join(p));
     }