diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
index 7785808f3693..70110c3b5c82 100644
--- a/atom/browser/api/atom_api_web_contents.cc
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -144,7 +144,7 @@ struct Converter<net::HttpResponseHeaders*> {
                                    net::HttpResponseHeaders* headers) {
     base::DictionaryValue response_headers;
     if (headers) {
-      void* iter = nullptr;
+      size_t iter = 0;
       std::string key;
       std::string value;
       while (headers->EnumerateHeaderLines(&iter, &key, &value)) {
diff --git a/atom/browser/net/atom_network_delegate.cc b/atom/browser/net/atom_network_delegate.cc
index 3143cd3b2575..39e0f732656b 100644
--- a/atom/browser/net/atom_network_delegate.cc
+++ b/atom/browser/net/atom_network_delegate.cc
@@ -100,7 +100,7 @@ void ToDictionary(base::DictionaryValue* details,
     return;
 
   scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue);
-  void* iter = nullptr;
+  size_t iter = 0;
   std::string key;
   std::string value;
   while (headers->EnumerateHeaderLines(&iter, &key, &value)) {