diff --git a/src/bootstrap/src/core/build_steps/tool.rs b/src/bootstrap/src/core/build_steps/tool.rs
index b58d279359e30..fc8d9d6d57b61 100644
--- a/src/bootstrap/src/core/build_steps/tool.rs
+++ b/src/bootstrap/src/core/build_steps/tool.rs
@@ -148,7 +148,9 @@ impl Step for ToolBuild {
             &self.extra_features,
         );
 
-        if path.ends_with("/rustdoc") &&
+        // Rustc tools (miri, clippy, cargo, rustfmt, rust-analyzer)
+        // could use the additional optimizations.
+        if self.mode == Mode::ToolRustc &&
             // rustdoc is performance sensitive, so apply LTO to it.
             is_lto_stage(&self.compiler)
         {