diff --git a/lib/utils.js b/lib/utils.js
index c985b0a954..e028c6763e 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -18,6 +18,15 @@ function isArray(val) {
   return toString.call(val) === '[object Array]';
 }
 
+/**
+ * Determine if a value is undefined
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if the value is undefined, otherwise false
+ */
+function isUndefined(val) {
+  return typeof val === 'undefined';
+}
 
 /**
  * Determine if a value is a Buffer
@@ -26,7 +35,8 @@ function isArray(val) {
  * @returns {boolean} True if value is a Buffer, otherwise false
  */
 function isBuffer(val) {
-  return ![undefined, null].includes(val) && val.constructor === Buffer;
+  return val !== null && !isUndefined(val) && val.constructor !== null && !isUndefined(val.constructor)
+    && typeof val.constructor.isBuffer === 'function' && val.constructor.isBuffer(val);
 }
 
 /**
@@ -85,16 +95,6 @@ function isNumber(val) {
   return typeof val === 'number';
 }
 
-/**
- * Determine if a value is undefined
- *
- * @param {Object} val The value to test
- * @returns {boolean} True if the value is undefined, otherwise false
- */
-function isUndefined(val) {
-  return typeof val === 'undefined';
-}
-
 /**
  * Determine if a value is an Object
  *