diff --git a/ch16/ex16_28_unique_ptr.h b/ch16/ex16_28_unique_ptr.h
index f58efc23..2c11bdea 100644
--- a/ch16/ex16_28_unique_ptr.h
+++ b/ch16/ex16_28_unique_ptr.h
@@ -45,7 +45,7 @@ template <typename T, typename D = Delete> class UniquePtr {
 
     void reset(T* q = nullptr) noexcept
     {
-        deleter_(q);
+        deleter_(_ptr);
         ptr_ = q;
     }