diff --git a/protos/protos.h b/protos/protos.h
index 0faf48ff85..2f3ae17226 100644
--- a/protos/protos.h
+++ b/protos/protos.h
@@ -19,7 +19,6 @@ using hpb::internal::SetExtension;
 }  // namespace internal
 
 using hpb::GetExtension;
-using hpb::HasExtension;
 
 using hpb::Arena;
 using hpb::Ptr;