diff --git a/src/node_threadsafe_cow-inl.h b/src/node_threadsafe_cow-inl.h
index 1cd0055ed80..40d2ae50fcc 100644
--- a/src/node_threadsafe_cow-inl.h
+++ b/src/node_threadsafe_cow-inl.h
@@ -1,6 +1,8 @@
 #ifndef SRC_NODE_THREADSAFE_COW_INL_H_
 #define SRC_NODE_THREADSAFE_COW_INL_H_
 
+#include "node_threadsafe_cow.h"
+
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 namespace node {
diff --git a/src/node_threadsafe_cow.h b/src/node_threadsafe_cow.h
index 8cfdd006b12..93115f1b4fb 100644
--- a/src/node_threadsafe_cow.h
+++ b/src/node_threadsafe_cow.h
@@ -3,6 +3,7 @@
 
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
+#include "node_mutex.h"
 #include "util.h"
 #include "uv.h"