diff --git a/src/node_messaging.cc b/src/node_messaging.cc
index 1028da69b44961..ebad6c67508105 100644
--- a/src/node_messaging.cc
+++ b/src/node_messaging.cc
@@ -900,6 +900,10 @@ void MessagePort::Entangle(MessagePort* a, MessagePortData* b) {
   MessagePortData::Entangle(a->data_.get(), b);
 }
 
+void MessagePort::MemoryInfo(MemoryTracker* tracker) const {
+  tracker->TrackField("data", data_);
+}
+
 Local<FunctionTemplate> GetMessagePortConstructorTemplate(Environment* env) {
   // Factor generating the MessagePort JS constructor into its own piece
   // of code, because it is needed early on in the child environment setup.
diff --git a/src/node_messaging.h b/src/node_messaging.h
index 526158e144d354..6d2410a7248b95 100644
--- a/src/node_messaging.h
+++ b/src/node_messaging.h
@@ -191,10 +191,7 @@ class MessagePort : public HandleWrap {
   // NULL pointer to the C++ MessagePort object is also detached.
   inline bool IsDetached() const;
 
-  void MemoryInfo(MemoryTracker* tracker) const override {
-    tracker->TrackField("data", data_);
-  }
-
+  void MemoryInfo(MemoryTracker* tracker) const override;
   SET_MEMORY_INFO_NAME(MessagePort)
   SET_SELF_SIZE(MessagePort)
 
diff --git a/src/node_worker.cc b/src/node_worker.cc
index b6f8df1a8b1db2..785f2783c22346 100644
--- a/src/node_worker.cc
+++ b/src/node_worker.cc
@@ -656,6 +656,10 @@ void Worker::Exit(int code) {
   }
 }
 
+void Worker::MemoryInfo(MemoryTracker* tracker) const {
+  tracker->TrackField("parent_port", parent_port_);
+}
+
 namespace {
 
 // Return the MessagePort that is global for this Environment and communicates
diff --git a/src/node_worker.h b/src/node_worker.h
index 6db7b258ebd81a..f84362f35c1897 100644
--- a/src/node_worker.h
+++ b/src/node_worker.h
@@ -39,13 +39,10 @@ class Worker : public AsyncWrap {
   // Wait for the worker thread to stop (in a blocking manner).
   void JoinThread();
 
-  void MemoryInfo(MemoryTracker* tracker) const override {
-    tracker->TrackField("parent_port", parent_port_);
-  }
-
   template <typename Fn>
   inline bool RequestInterrupt(Fn&& cb);
 
+  void MemoryInfo(MemoryTracker* tracker) const override;
   SET_MEMORY_INFO_NAME(Worker)
   SET_SELF_SIZE(Worker)