1 files changed, 2 insertions, 0 deletions
diff --git a/lib/internal/fs/streams.js b/lib/internal/fs/streams.js
index a79dfca9d5..059f203597 100644
--- a/lib/internal/fs/streams.js
+++ b/lib/internal/fs/streams.js
@@ -119,6 +119,7 @@ function ReadStream(path, options) {
   });
 }
 Object.setPrototypeOf(ReadStream.prototype, Readable.prototype);
+Object.setPrototypeOf(ReadStream, Readable);
 
 ReadStream.prototype.open = function() {
   fs.open(this.path, this.flags, this.mode, (er, fd) => {
@@ -273,6 +274,7 @@ function WriteStream(path, options) {
     this.open();
 }
 Object.setPrototypeOf(WriteStream.prototype, Writable.prototype);
+Object.setPrototypeOf(WriteStream, Writable);
 
 WriteStream.prototype._final = function(callback) {
   if (this.autoClose) {