diff --git a/fetch.js b/fetch.js
index 86fe318a73194936a6b48cd1bcf4be140294239f..73201e3f48ac65f4c970d786b66a52fcba36e630 100644
--- a/fetch.js
+++ b/fetch.js
@@ -204,7 +204,7 @@
     this.mode = options.mode || null
     this.referrer = null
 
-    if ((this.method === 'GET' || this.method == 'HEAD') && options.body) {
+    if ((this.method === 'GET' || this.method === 'HEAD') && options.body) {
       throw new TypeError()
     }
     this._initBody(options.body)