diff --git a/tools/gn2bp/gn_utils.py b/tools/gn2bp/gn_utils.py
index 589b12a..6fcc0f8 100644
--- a/tools/gn2bp/gn_utils.py
+++ b/tools/gn2bp/gn_utils.py
@@ -110,6 +110,7 @@
       self.proto_plugin = None
       self.proto_paths = set()
       self.proto_exports = set()
+      self.proto_in_dir = ""
 
       self.sources = set()
       # TODO(primiano): consider whether the public section should be part of
@@ -232,6 +233,7 @@
       target.proto_plugin = proto_target_type
       target.proto_paths.update(self.get_proto_paths(proto_desc))
       target.proto_exports.update(self.get_proto_exports(proto_desc))
+      target.proto_in_dir = self.get_proto_in_dir(proto_desc)
       target.sources.update(proto_desc.get('sources', []))
       assert (all(x.endswith('.proto') for x in target.sources))
     elif target.type == 'source_set':
@@ -322,6 +324,11 @@
     metadata = proto_desc.get('metadata', {})
     return metadata.get('import_dirs', [])
 
+
+  def get_proto_in_dir(self, proto_desc):
+    args = proto_desc.get('args')
+    return re.sub('^\.\./\.\./', '', args[args.index('--proto-in-dir') + 1])
+
   def get_proto_target_type(self, target):
     """ Checks if the target is a proto library and return the plugin.