diff --git a/lib/readline-sync.js b/lib/readline-sync.js
index f34579d..97f15f8 100644
--- a/lib/readline-sync.js
+++ b/lib/readline-sync.js
@@ -269,6 +269,9 @@ function _readlineSync(options) {
       if (!fsB) {
         fsB = process.binding('fs'); // For raw device path
         constants = process.binding('constants');
+        // for v6.3.0+
+        constants = constants && constants.fs && typeof constants.fs.O_RDWR === 'number'
+          ? constants.fs : constants;
       }
       return fsB;
     }