diff --git a/src/ORM/DataQuery.php b/src/ORM/DataQuery.php
index 93d02b5c6..c15bb569d 100644
--- a/src/ORM/DataQuery.php
+++ b/src/ORM/DataQuery.php
@@ -485,7 +485,7 @@ class DataQuery
         $result = reset($row);
 
         // Checking for 't' supports PostgreSQL before silverstripe/postgresql@2.2
-        return $result === true || $result === 1 || $result === 't';
+        return $result === true || $result === 1 || $result === '1' || $result === 't';
     }
 
     /**