diff --git a/pkgs/blast_repo/lib/src/tweaks/drop_lint_tweak.dart b/pkgs/blast_repo/lib/src/tweaks/drop_lint_tweak.dart
index 2bf9f5be..91b79092 100644
--- a/pkgs/blast_repo/lib/src/tweaks/drop_lint_tweak.dart
+++ b/pkgs/blast_repo/lib/src/tweaks/drop_lint_tweak.dart
@@ -73,7 +73,7 @@ class DropLintTweak extends RepoTweak {
           return FixResult(fixes: []);
         }
 
-        throw UnimplementedError('not sure what to do with ${rules}');
+        throw UnimplementedError('not sure what to do with $rules');
       }
     }