diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index eb57e56..085fa2f 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -20,7 +20,7 @@
 /// Convert a URL query string (or `application/x-www-form-urlencoded` body)
 /// into a [Map] from parameter names to values.
 Map<String, String> queryToMap(String queryList) {
-  var map = <String>{};
+  var map = <String, String>{};
   for (var pair in queryList.split("&")) {
     var split = split1(pair, "=");
     if (split.isEmpty) continue;