fix rule description
diff --git a/lib/src/rules/unsafe_html.dart b/lib/src/rules/unsafe_html.dart
index 48556a0..0f397e0 100644
--- a/lib/src/rules/unsafe_html.dart
+++ b/lib/src/rules/unsafe_html.dart
@@ -9,7 +9,7 @@
 import 'package:linter/src/util/dart_type_utilities.dart';
 
 const _descPrefix = r'Avoid unsafe HTML APIs';
-const _desc = r'$_descPrefix.';
+const _desc = '$_descPrefix.';
 
 const _details = r'''