diff --git a/lib/buffer.js b/lib/buffer.js
index 4166724b732..90ff4319105 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -116,7 +116,7 @@ function fromObject(obj) {
     return b;
   }
 
-  if (obj == null) {
+  if (obj === null) {
     throw new TypeError('must start with number, buffer, array or string');
   }