diff --git a/index.js b/index.js
index 4d12bba2..1ab519be 100644
--- a/index.js
+++ b/index.js
@@ -277,7 +277,7 @@ function shouldTransform (req, res) {
  */
 
 function toBuffer (chunk, encoding) {
-  return !Buffer.isBuffer(chunk)
-    ? Buffer.from(chunk, encoding)
-    : chunk
+  return Buffer.isBuffer(chunk)
+    ? chunk
+    : Buffer.from(chunk, encoding)
 }