diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
index 1a6600a926e3..3f1a8b594f7c 100644
--- a/atom/browser/api/atom_api_web_contents.cc
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -143,7 +143,6 @@ struct Converter<net::HttpResponseHeaders*> {
       std::string value;
       while (headers->EnumerateHeaderLines(&iter, &key, &value)) {
         key = base::StringToLowerASCII(key);
-        value = base::StringToLowerASCII(value);
         if (response_headers.HasKey(key)) {
           base::ListValue* values = nullptr;
           if (response_headers.GetList(key, &values))