diff --git a/tools/gn2bp/gn_utils.py b/tools/gn2bp/gn_utils.py
index 7b54213..95f677a 100644
--- a/tools/gn2bp/gn_utils.py
+++ b/tools/gn2bp/gn_utils.py
@@ -150,7 +150,7 @@
 def label_to_path(label):
   """Turn a GN output label (e.g., //some_dir/file.cc) into a path."""
   assert label.startswith('//')
-  return label[2:]
+  return label[2:] or "./"
 
 
 def label_without_toolchain(label):