diff --git a/images/php/mtk/drupal.conf b/images/php/mtk/drupal.conf
index 18e4df9d..8e797e07 100644
--- a/images/php/mtk/drupal.conf
+++ b/images/php/mtk/drupal.conf
@@ -11,7 +11,7 @@ rewrite:
 where:
   # Exclude audit messages older than 7 days.
   admin_audit_trail: |-
-    created >= DATE_SUB(NOW(), INTERVAL 7 DAY)
+    created >= FROM_UNIXTIME(DATE_SUB(NOW(), INTERVAL 7 DAY))
   # Exclude unpublished revision data that takes up too much space.
   # Paragraphs
   paragraphs_item_revision: |-
@@ -61,4 +61,4 @@ nodata:
   - purge_queue
   - queue
   - sessions
-  - webform_*
\ No newline at end of file
+  - webform_*