diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
index d6af8589f3bc85..afa53bc93fb34b 100644
--- a/lib/_stream_readable.js
+++ b/lib/_stream_readable.js
@@ -5,7 +5,9 @@ Readable.ReadableState = ReadableState;
 
 const EE = require('events');
 const Stream = require('stream');
-const Buffer = require('buffer').Buffer;
+// TODO(bmeurer): Change this back to const once hole checks are
+// properly optimized away early in Ignition+TurboFan.
+var Buffer = require('buffer').Buffer;
 const util = require('util');
 const debug = util.debuglog('stream');
 const BufferList = require('internal/streams/BufferList');
diff --git a/lib/_stream_wrap.js b/lib/_stream_wrap.js
index fbc32965980e96..f3f79ebf05ba5f 100644
--- a/lib/_stream_wrap.js
+++ b/lib/_stream_wrap.js
@@ -4,7 +4,9 @@ const assert = require('assert');
 const util = require('util');
 const Socket = require('net').Socket;
 const JSStream = process.binding('js_stream').JSStream;
-const Buffer = require('buffer').Buffer;
+// TODO(bmeurer): Change this back to const once hole checks are
+// properly optimized away early in Ignition+TurboFan.
+var Buffer = require('buffer').Buffer;
 const uv = process.binding('uv');
 const debug = util.debuglog('stream_wrap');