diff --git a/api/app/lib/models/email_send_log.js b/api/app/lib/models/email_send_log.js
index 667f847..e1d95b6 100644
--- a/api/app/lib/models/email_send_log.js
+++ b/api/app/lib/models/email_send_log.js
@@ -62,7 +62,7 @@ module.exports = dc => {
       autoIncrement: false
     },
     toPepUserIds: {
-      type: array,
+      type: DataTypes.ARRAY(DataTypes.INTEGER),
       allowNull: false,
       defaultValue: null,
       comment: null,