diff --git a/fetch.js b/fetch.js
index f88488cd..ef714825 100644
--- a/fetch.js
+++ b/fetch.js
@@ -358,6 +358,21 @@ export function Request(input, options) {
     throw new TypeError('Body not allowed for GET or HEAD requests')
   }
   this._initBody(body)
+
+  if (this.method === 'GET' || this.method === 'HEAD') {
+    if (options.cache === 'no-store' || options.cache === 'no-cache') {
+      // Search for a '_' parameter in the query string
+      var reParamSearch = /([?&])_=[^&]*/
+      if (reParamSearch.test(this.url)) {
+        // If it already exists then set the value with the current time
+        this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime())
+      } else {
+        // Otherwise add a new '_' parameter to the end with the current time
+        var reQueryString = /\?/
+        this.url += (reQueryString.test(this.url) ? '&' : '?') + '_=' + new Date().getTime()
+      }
+    }
+  }
 }
 
 Request.prototype.clone = function() {