diff --git a/src/SequelizeStore.js b/src/SequelizeStore.js
index f5bceb4..30621e7 100644
--- a/src/SequelizeStore.js
+++ b/src/SequelizeStore.js
@@ -116,7 +116,8 @@ class SequelizeStore extends Store {
     }
 
     async _increment(table, where, nb = 1, field) {
-        return table.update({ [field]: global.sequelize.literal(`${field} + ${nb}`) }, { where });
+        let sequelizeTmp = global.sequelize || this.sequelize; // for sequelize v6
+        return table.update({ [field]: sequelizeTmp.literal(`${field} + ${nb}`) }, { where });
     }
 
     // remove all if time is passed