diff --git a/src/node_constants.cc b/src/node_constants.cc
index 06397b9280..2aea278cb6 100644
--- a/src/node_constants.cc
+++ b/src/node_constants.cc
@@ -106,6 +106,9 @@ void DefineConstants(Handle<Object> target) {
   NODE_DEFINE_CONSTANT(target, O_SYMLINK);
 #endif
 
+#ifdef O_DIRECT
+  NODE_DEFINE_CONSTANT(target, O_DIRECT);
+#endif
 
 #ifdef S_IRWXU
   NODE_DEFINE_CONSTANT(target, S_IRWXU);