diff --git a/analysis_options.yaml b/analysis_options.yaml
index a733a58a24..046afd132f 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -72,7 +72,7 @@ linter:
     - avoid_relative_lib_imports
     - avoid_renaming_method_parameters
     - avoid_return_types_on_setters
-    # - avoid_returning_null # still violated by some pre-nnbd code that we haven't yet migrated
+    - avoid_returning_null
     - avoid_returning_null_for_future
     - avoid_returning_null_for_void
     # - avoid_returning_this # there are enough valid reasons to return `this` that this lint ends up with too many false positives