diff --git a/ctl/shared_ptr.h b/ctl/shared_ptr.h
index 619c3d7a6..2cbd56b44 100644
--- a/ctl/shared_ptr.h
+++ b/ctl/shared_ptr.h
@@ -25,6 +25,7 @@ struct shared_control
     constexpr shared_control() noexcept : shared(0), weak(0)
     {
     }
+    shared_control(const shared_control&) = delete;
     virtual ~shared_control()
     {
     }