diff --git a/lib/utils.js b/lib/utils.js
index 5d966f4448..8c2736bccd 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -54,7 +54,7 @@ function isArrayBuffer(val) {
  * @returns {boolean} True if value is an FormData, otherwise false
  */
 function isFormData(val) {
-  return (typeof FormData !== 'undefined') && (val instanceof FormData);
+  return toString.call(val) === '[object FormData]';
 }
 
 /**
@@ -68,7 +68,7 @@ function isArrayBufferView(val) {
   if ((typeof ArrayBuffer !== 'undefined') && (ArrayBuffer.isView)) {
     result = ArrayBuffer.isView(val);
   } else {
-    result = (val) && (val.buffer) && (val.buffer instanceof ArrayBuffer);
+    result = (val) && (val.buffer) && (isArrayBuffer(val.buffer));
   }
   return result;
 }
@@ -175,7 +175,7 @@ function isStream(val) {
  * @returns {boolean} True if value is a URLSearchParams object, otherwise false
  */
 function isURLSearchParams(val) {
-  return typeof URLSearchParams !== 'undefined' && val instanceof URLSearchParams;
+  return toString.call(val) === '[object URLSearchParams]';
 }
 
 /**