diff --git a/lib/model.js b/lib/model.js
index 8e1b98e6a765..22bb01ead46b 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -2480,7 +2480,7 @@ class Model {
     const now = Utils.now(this.sequelize.options.dialect);
 
     // Attach createdAt
-    if (createdAtAttr && !updateValues[createdAtAttr]) {
+    if (createdAtAttr && !insertValues[createdAtAttr]) {
       const field = this.rawAttributes[createdAtAttr].field || createdAtAttr;
       insertValues[field] = this._getDefaultTimestamp(createdAtAttr) || now;
     }
diff --git a/test/integration/model/upsert.test.js b/test/integration/model/upsert.test.js
index 2a67cb18e6c7..26e51c7bbc26 100644
--- a/test/integration/model/upsert.test.js
+++ b/test/integration/model/upsert.test.js
@@ -302,6 +302,15 @@ describe(Support.getTestDialectTeaser('Model'), () => {
         clock.restore();
       });
 
+      it('does not overwrite createdAt when supplied as an explicit insert value when using fields', async function() {
+        const clock = sinon.useFakeTimers();
+        const originalCreatedAt = new Date('2010-01-01T12:00:00.000Z');
+        await this.User.upsert({ id: 42, username: 'john', createdAt: originalCreatedAt }, { fields: ['id', 'username'] });
+        const user = await this.User.findByPk(42);
+        expect(user.createdAt).to.deep.equal(originalCreatedAt);
+        clock.restore();
+      });
+
       it('does not update using default values', async function() {
         await this.User.create({ id: 42, username: 'john', baz: 'new baz value' });
         const user0 = await this.User.findByPk(42);