diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index b90b2186959b2e..cf945cd7812d07 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -158,7 +158,7 @@ class ChannelWrap : public AsyncWrap {
   }
   inline node_ares_task_list* task_list() { return &task_list_; }
 
-  size_t self_size() const override { return sizeof(this); }
+  size_t self_size() const override { return sizeof(*this); }
 
   static void AresTimeout(uv_timer_t* handle);