diff --git a/libc/system_properties/context_node.h b/libc/system_properties/context_node.h
index 1c6cbbb..769b853 100644
--- a/libc/system_properties/context_node.h
+++ b/libc/system_properties/context_node.h
@@ -41,9 +41,16 @@
   ~ContextNode() {
     Unmap();
   }
+
+  ContextNode(const ContextNode&) = delete;
+  ContextNode(ContextNode&&) = delete;
+  void operator=(const ContextNode&) = delete;
+  void operator=(const ContextNode&&) = delete;
+
   bool Open(bool access_rw, bool* fsetxattr_failed);
   bool CheckAccessAndOpen();
   void ResetAccess();
+  void Unmap();
 
   const char* context() const {
     return context_;
@@ -54,7 +61,6 @@
 
  private:
   bool CheckAccess();
-  void Unmap();
 
   Lock lock_;
   const char* context_;