diff --git a/src/aliased_buffer.h b/src/aliased_buffer.h
index 10659f6d529f02..931b2753646b8c 100644
--- a/src/aliased_buffer.h
+++ b/src/aliased_buffer.h
@@ -1,7 +1,8 @@
-
 #ifndef SRC_ALIASED_BUFFER_H_
 #define SRC_ALIASED_BUFFER_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "v8.h"
 #include "util-inl.h"
 
@@ -235,4 +236,6 @@ class AliasedBuffer {
 };
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_ALIASED_BUFFER_H_
diff --git a/src/inspector_agent.h b/src/inspector_agent.h
index 4e32d3ef1a96b4..d9e2232dcc4d7b 100644
--- a/src/inspector_agent.h
+++ b/src/inspector_agent.h
@@ -1,6 +1,8 @@
 #ifndef SRC_INSPECTOR_AGENT_H_
 #define SRC_INSPECTOR_AGENT_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include <memory>
 
 #include <stddef.h>
@@ -120,4 +122,6 @@ class Agent {
 }  // namespace inspector
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_INSPECTOR_AGENT_H_
diff --git a/src/inspector_io.h b/src/inspector_io.h
index 2b9f0acd48383d..21df54e03126e9 100644
--- a/src/inspector_io.h
+++ b/src/inspector_io.h
@@ -1,6 +1,8 @@
 #ifndef SRC_INSPECTOR_IO_H_
 #define SRC_INSPECTOR_IO_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "inspector_socket_server.h"
 #include "node_mutex.h"
 #include "uv.h"
@@ -90,4 +92,6 @@ class InspectorIo {
 }  // namespace inspector
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_INSPECTOR_IO_H_
diff --git a/src/inspector_socket.h b/src/inspector_socket.h
index ae49d78ff3452a..eca88ad45fe379 100644
--- a/src/inspector_socket.h
+++ b/src/inspector_socket.h
@@ -1,6 +1,8 @@
 #ifndef SRC_INSPECTOR_SOCKET_H_
 #define SRC_INSPECTOR_SOCKET_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "util-inl.h"
 #include "uv.h"
 
@@ -52,5 +54,6 @@ class InspectorSocket {
 }  // namespace inspector
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 #endif  // SRC_INSPECTOR_SOCKET_H_
diff --git a/src/inspector_socket_server.h b/src/inspector_socket_server.h
index 271be6ec555bf1..5c61b4e5ee3ddc 100644
--- a/src/inspector_socket_server.h
+++ b/src/inspector_socket_server.h
@@ -1,6 +1,8 @@
 #ifndef SRC_INSPECTOR_SOCKET_SERVER_H_
 #define SRC_INSPECTOR_SOCKET_SERVER_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "inspector_agent.h"
 #include "inspector_socket.h"
 #include "uv.h"
@@ -98,4 +100,6 @@ class InspectorSocketServer {
 }  // namespace inspector
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_INSPECTOR_SOCKET_SERVER_H_
diff --git a/src/node_context_data.h b/src/node_context_data.h
index 3892b31354027d..61ab81523cea59 100644
--- a/src/node_context_data.h
+++ b/src/node_context_data.h
@@ -1,6 +1,8 @@
 #ifndef SRC_NODE_CONTEXT_DATA_H_
 #define SRC_NODE_CONTEXT_DATA_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 namespace node {
 
 // Pick an index that's hopefully out of the way when we're embedded inside
@@ -37,4 +39,6 @@ enum ContextEmbedderIndex {
 
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_NODE_CONTEXT_DATA_H_
diff --git a/src/node_contextify.h b/src/node_contextify.h
index d094692186167e..8af1d1d4fc3286 100644
--- a/src/node_contextify.h
+++ b/src/node_contextify.h
@@ -1,6 +1,8 @@
 #ifndef SRC_NODE_CONTEXTIFY_H_
 #define SRC_NODE_CONTEXTIFY_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "node_internals.h"
 #include "node_context_data.h"
 
@@ -107,4 +109,6 @@ class ContextifyContext {
 }  // namespace contextify
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_NODE_CONTEXTIFY_H_
diff --git a/src/node_mutex.h b/src/node_mutex.h
index 9e1d31654f7dbf..de62a0d9ff66b7 100644
--- a/src/node_mutex.h
+++ b/src/node_mutex.h
@@ -1,6 +1,8 @@
 #ifndef SRC_NODE_MUTEX_H_
 #define SRC_NODE_MUTEX_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "util.h"
 #include "uv.h"
 
@@ -184,4 +186,6 @@ MutexBase<Traits>::ScopedUnlock::~ScopedUnlock() {
 
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_NODE_MUTEX_H_
diff --git a/src/node_perf_common.h b/src/node_perf_common.h
index 8f90c93060dc4c..3c7e51361e6eae 100644
--- a/src/node_perf_common.h
+++ b/src/node_perf_common.h
@@ -1,6 +1,8 @@
 #ifndef SRC_NODE_PERF_COMMON_H_
 #define SRC_NODE_PERF_COMMON_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include "node.h"
 #include "v8.h"
 
@@ -87,4 +89,6 @@ class performance_state {
 }  // namespace performance
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_NODE_PERF_COMMON_H_
diff --git a/src/node_platform.h b/src/node_platform.h
index 78b2883393b9fa..c2b5d6a5f9c704 100644
--- a/src/node_platform.h
+++ b/src/node_platform.h
@@ -1,6 +1,8 @@
 #ifndef SRC_NODE_PLATFORM_H_
 #define SRC_NODE_PLATFORM_H_
 
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #include <queue>
 #include <unordered_map>
 #include <vector>
@@ -160,4 +162,6 @@ class NodePlatform : public MultiIsolatePlatform {
 
 }  // namespace node
 
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
 #endif  // SRC_NODE_PLATFORM_H_