diff --git a/src/bootstrap/src/core/builder/mod.rs b/src/bootstrap/src/core/builder/mod.rs
index c3a74683cd329..aaee1b08a4034 100644
--- a/src/bootstrap/src/core/builder/mod.rs
+++ b/src/bootstrap/src/core/builder/mod.rs
@@ -825,8 +825,12 @@ impl<'a> Builder<'a> {
         match kind {
             Kind::Build => describe!(
                 compile::Std,
-                compile::Rustc,
+                // FIXME(#135022): `compile::Assemble` **must** come before `compile::Rustc` after
+                // `PathSet` also permits prefix-matching, because `compile::Rustc` can consume the
+                // `"compiler"` path filter first, causing `compile::Assemble` to no longer run when
+                // the user writes `./x build compiler --stage 0`.
                 compile::Assemble,
+                compile::Rustc,
                 compile::CodegenBackend,
                 compile::StartupObjects,
                 tool::BuildManifest,