diff --git a/spec/support/helpers/stub_feature_flags.rb b/spec/support/helpers/stub_feature_flags.rb
index 31ae9570ec7..e301e29afc2 100644
--- a/spec/support/helpers/stub_feature_flags.rb
+++ b/spec/support/helpers/stub_feature_flags.rb
@@ -37,7 +37,9 @@ module StubFeatureFlags
   #   Enable `ci_live_trace` feature flag only on the specified projects.
   def stub_feature_flags(features)
     features.each do |feature_name, actors|
-      warn "Invalid Feature Flag #{feature_name} stubbed" unless Feature::Definition.get(feature_name)
+      unless Feature::Definition.get(feature_name)
+        ActiveSupport::Deprecation.warn "Invalid Feature Flag #{feature_name} stubbed"
+      end
 
       # Remove feature flag overwrite
       feature = Feature.get(feature_name) # rubocop:disable Gitlab/AvoidFeatureGet