diff --git a/linker/linker_config.h b/linker/linker_config.h
index 4ec8b26..6f8bffb 100644
--- a/linker/linker_config.h
+++ b/linker/linker_config.h
@@ -62,7 +62,7 @@
 class NamespaceConfig {
  public:
   explicit NamespaceConfig(const std::string& name)
-      : name_(name), isolated_(false)
+      : name_(name), isolated_(false), visible_(false)
   {}
 
   const char* name() const {
@@ -73,6 +73,10 @@
     return isolated_;
   }
 
+  bool visible() const {
+    return visible_;
+  }
+
   const std::vector<std::string>& search_paths() const {
     return search_paths_;
   }
@@ -93,6 +97,10 @@
     isolated_ = isolated;
   }
 
+  void set_visible(bool visible) {
+    visible_ = visible;
+  }
+
   void set_search_paths(std::vector<std::string>&& search_paths) {
     search_paths_ = search_paths;
   }
@@ -103,6 +111,7 @@
  private:
   const std::string name_;
   bool isolated_;
+  bool visible_;
   std::vector<std::string> search_paths_;
   std::vector<std::string> permitted_paths_;
   std::vector<NamespaceLinkConfig> namespace_links_;