diff --git a/doctrine/doctrine-bundle/1.12/config/packages/doctrine.yaml b/doctrine/doctrine-bundle/1.12/config/packages/doctrine.yaml
index c052bb0b..2ef77cc0 100644
--- a/doctrine/doctrine-bundle/1.12/config/packages/doctrine.yaml
+++ b/doctrine/doctrine-bundle/1.12/config/packages/doctrine.yaml
@@ -10,6 +10,9 @@ doctrine:
         charset: utf8mb4
         default_table_options:
             collate: utf8mb4_unicode_ci
+
+        # backtrace queries in profiler (increases memory usage per request)
+        #profiling_collect_backtrace: '%kernel.debug%'
     orm:
         auto_generate_proxy_classes: true
         naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware