diff --git a/lib/analysis_options.yaml b/lib/analysis_options.yaml
index 78d35b72..5bd79756 100644
--- a/lib/analysis_options.yaml
+++ b/lib/analysis_options.yaml
@@ -288,3 +288,6 @@ linter:
     - use_test_throws_matchers
     - valid_regexps
     - void_checks
+
+formatter:
+  trailing_commas: preserve