diff --git a/lib/core/constants.dart b/lib/core/constants.dart
index c83e0ca41..e028840a9 100644
--- a/lib/core/constants.dart
+++ b/lib/core/constants.dart
@@ -1,4 +1,4 @@
-
+// @dart = 2.7
 
 const int kThumbnailSmallSize = 256;
 const int kThumbnailQuality = 50;