diff --git a/python/mozbuild/mozbuild/generated_sources.py b/python/mozbuild/mozbuild/generated_sources.py
index be3711039f541..53f548ce642d6 100644
--- a/python/mozbuild/mozbuild/generated_sources.py
+++ b/python/mozbuild/mozbuild/generated_sources.py
@@ -49,8 +49,7 @@ def get_generated_sources():
     # Next, return any Rust source files that were generated into the Rust
     # object directory.
     rust_build_kind = 'debug' if buildconfig.substs.get('MOZ_DEBUG_RUST') else 'release'
-    base = mozpath.join('toolkit/library',
-                        buildconfig.substs['RUST_TARGET'],
+    base = mozpath.join(buildconfig.substs['RUST_TARGET'],
                         rust_build_kind,
                         'build')
     finder = FileFinder(mozpath.join(buildconfig.topobjdir, base))