diff --git a/lib/googl/utils.rb b/lib/googl/utils.rb
index fc2c204..ace7935 100644
--- a/lib/googl/utils.rb
+++ b/lib/googl/utils.rb
@@ -10,7 +10,7 @@ module Utils # :nodoc:
     private
 
     def modify_headers(item)
-      Googl::Request.headers.merge!(item)
+      Googl::Request.headers(item)
     end
 
     def post(url, params={})