diff --git a/includes/base.inc b/includes/base.inc
index 7b74710..d3ab02d 100644
--- a/includes/base.inc
+++ b/includes/base.inc
@@ -931,7 +931,7 @@ abstract class MigrationBase {
                      ->fields(array(
                        'machine_name' => $this->machineName,
                        'process_type' => $newStatus,
-                       'starttime' => round(microtime(TRUE) * 1000),
+                       'starttime' => sprintf('%s', round(microtime(TRUE) * 1000)),
                        'initialHighwater' => $this->getHighwater(),
                        ))
                      ->execute();