diff --git a/src/wretcher.ts b/src/wretcher.ts
index 23bec15..186d5f2 100644
--- a/src/wretcher.ts
+++ b/src/wretcher.ts
@@ -29,7 +29,7 @@ export class Wretcher {
      * @param mixin If true, mixes in instead of replacing the existing options
      */
     defaults(opts: RequestInit, mixin = false) {
-        conf.defaults = mixin ? conf.defaults = mix(conf.defaults, opts) : opts
+        conf.defaults = mixin ? mix(conf.defaults, opts) : opts
         return this
     }