diff --git a/tools/system_libs.py b/tools/system_libs.py
index 6ef19ea06c656..ef896f6ec96ac 100644
--- a/tools/system_libs.py
+++ b/tools/system_libs.py
@@ -529,7 +529,7 @@ def build_objects(self, build_dir):
       elif batch_inputs:
         # Use relative paths to reduce the length of the command line.
         # This allows to avoid switching to a response file as often.
-        src = os.path.relpath(src, self.build_dir)
+        src = os.path.relpath(src, build_dir)
         src = utils.normalize_path(src)
         batches.setdefault(tuple(cmd), []).append(src)
       else: