diff --git a/src/node_external_reference.h b/src/node_external_reference.h
index e516bf6471d4af..09a24aeef1b07f 100644
--- a/src/node_external_reference.h
+++ b/src/node_external_reference.h
@@ -123,6 +123,7 @@ class ExternalReferenceRegistry {
   V(string_decoder)                                                            \
   V(stream_wrap)                                                               \
   V(signal_wrap)                                                               \
+  V(spawn_sync)                                                                \
   V(trace_events)                                                              \
   V(timers)                                                                    \
   V(types)                                                                     \
diff --git a/src/spawn_sync.cc b/src/spawn_sync.cc
index b3c0fabafdaad2..3b73dc4a614b9a 100644
--- a/src/spawn_sync.cc
+++ b/src/spawn_sync.cc
@@ -22,6 +22,7 @@
 #include "spawn_sync.h"
 #include "debug_utils-inl.h"
 #include "env-inl.h"
+#include "node_external_reference.h"
 #include "node_internals.h"
 #include "string_bytes.h"
 #include "util-inl.h"
@@ -366,6 +367,10 @@ void SyncProcessRunner::Initialize(Local<Object> target,
   SetMethod(context, target, "spawn", Spawn);
 }
 
+void SyncProcessRunner::RegisterExternalReferences(
+    ExternalReferenceRegistry* registry) {
+  registry->Register(Spawn);
+}
 
 void SyncProcessRunner::Spawn(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
@@ -1107,3 +1112,5 @@ void SyncProcessRunner::KillTimerCloseCallback(uv_handle_t* handle) {
 
 NODE_BINDING_CONTEXT_AWARE_INTERNAL(spawn_sync,
                                     node::SyncProcessRunner::Initialize)
+NODE_BINDING_EXTERNAL_REFERENCE(
+    spawn_sync, node::SyncProcessRunner::RegisterExternalReferences)
diff --git a/src/spawn_sync.h b/src/spawn_sync.h
index 81a2f2aaa899ba..d5b74e67d83094 100644
--- a/src/spawn_sync.h
+++ b/src/spawn_sync.h
@@ -30,8 +30,7 @@
 
 namespace node {
 
-
-
+class ExternalReferenceRegistry;
 class SyncProcessOutputBuffer;
 class SyncProcessStdioPipe;
 class SyncProcessRunner;
@@ -140,6 +139,7 @@ class SyncProcessRunner {
   };
 
  public:
+  static void RegisterExternalReferences(ExternalReferenceRegistry* registry);
   static void Initialize(v8::Local<v8::Object> target,
                          v8::Local<v8::Value> unused,
                          v8::Local<v8::Context> context,