diff --git a/download.h b/download.h
index 2b49ab9..37e0382 100644
--- a/download.h
+++ b/download.h
@@ -64,8 +64,7 @@ namespace Hanabi {
 
 std::vector<Hanabi::Card> parse_deck(const boost::json::value& deck_json) {
     auto deck = boost::json::value_to<std::vector<Hanabi::Card>>(deck_json);
-    for(size_t i = 0; i < deck.size(); i++) {
-      auto &card = deck[i];
+    for(auto & card : deck) {
       assert(card.rank < 5);
       assert(card.rank >= 0);
       assert(card.suit < 6);