diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
index 1a0bc8902ac802..123a4f3558e103 100644
--- a/lib/_stream_readable.js
+++ b/lib/_stream_readable.js
@@ -26,9 +26,7 @@ Readable.ReadableState = ReadableState;
 
 const EE = require('events');
 const Stream = require('stream');
-// TODO(bmeurer): Change this back to const once hole checks are
-// properly optimized away early in Ignition+TurboFan.
-var Buffer = require('buffer').Buffer;
+const Buffer = require('buffer').Buffer;
 const util = require('util');
 const debug = util.debuglog('stream');
 const BufferList = require('internal/streams/BufferList');