diff --git a/src/node_messaging.cc b/src/node_messaging.cc
index b51607cc0ee371..f55cb7ed9bd08c 100644
--- a/src/node_messaging.cc
+++ b/src/node_messaging.cc
@@ -927,6 +927,10 @@ 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 054521b0563c42..d64bf23e086d05 100644
--- a/src/node_messaging.h
+++ b/src/node_messaging.h
@@ -192,10 +192,7 @@ 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 045fcc74a3a2f6..eeed824f66dee9 100644
--- a/src/node_worker.cc
+++ b/src/node_worker.cc
@@ -709,6 +709,10 @@ 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 5511e0f1a2eb4a..863e2cffde0f36 100644
--- a/src/node_worker.h
+++ b/src/node_worker.h
@@ -40,13 +40,10 @@ 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)