diff --git a/lib/dotenv/dotenv_parser.dart b/lib/dotenv/dotenv_parser.dart
index a8bd2e1..9f2d478 100644
--- a/lib/dotenv/dotenv_parser.dart
+++ b/lib/dotenv/dotenv_parser.dart
@@ -24,7 +24,7 @@ class DotenvParser {
   /// Parses a single line into a key-value pair.
   @visibleForTesting
   Map<String, String> parseOne(String line,
-      {Map<String, String> env: const {}}) {
+      {Map<String, String> env = const {}}) {
     var stripped = strip(line);
     if (!_isValid(stripped)) return {};