diff --git a/test/api/v3/integration/tasks/POST-tasks_user.test.js b/test/api/v3/integration/tasks/POST-tasks_user.test.js
index 0c467c2891..99d2896e3b 100644
--- a/test/api/v3/integration/tasks/POST-tasks_user.test.js
+++ b/test/api/v3/integration/tasks/POST-tasks_user.test.js
@@ -152,14 +152,14 @@ describe('POST /tasks/user', () => {
         text: 'test habit',
         type: 'habit',
         reminders: [
-          {id: id1, startDate: new Date(), time: new Date()},
+          {_id: id1, startDate: new Date(), time: new Date()},
         ],
       });
 
       expect(task.reminders).to.be.an('array');
       expect(task.reminders.length).to.eql(1);
       expect(task.reminders[0]).to.be.an('object');
-      expect(task.reminders[0].id).to.eql(id1);
+      expect(task.reminders[0]._id).to.eql(id1);
       expect(task.reminders[0].startDate).to.be.a('string'); // json doesn't have dates
       expect(task.reminders[0].time).to.be.a('string');
     });
diff --git a/test/api/v3/integration/tasks/PUT-tasks_id.test.js b/test/api/v3/integration/tasks/PUT-tasks_id.test.js
index c5bc5d050f..79a45a09ad 100644
--- a/test/api/v3/integration/tasks/PUT-tasks_id.test.js
+++ b/test/api/v3/integration/tasks/PUT-tasks_id.test.js
@@ -80,14 +80,14 @@ describe('PUT /tasks/:id', () => {
 
       let savedDaily = await user.put(`/tasks/${daily._id}`, {
         reminders: [
-          {id: id1, time: new Date(), startDate: new Date()},
-          {id: id2, time: new Date(), startDate: new Date()},
+          {_id: id1, time: new Date(), startDate: new Date()},
+          {_id: id2, time: new Date(), startDate: new Date()},
         ],
       });
 
       expect(savedDaily.reminders.length).to.equal(2);
-      expect(savedDaily.reminders[0].id).to.equal(id1);
-      expect(savedDaily.reminders[1].id).to.equal(id2);
+      expect(savedDaily.reminders[0]._id).to.equal(id1);
+      expect(savedDaily.reminders[1]._id).to.equal(id2);
     });
   });
 
diff --git a/website/src/controllers/api-v3/tasks.js b/website/src/controllers/api-v3/tasks.js
index 527bb90265..16c0457bbf 100644
--- a/website/src/controllers/api-v3/tasks.js
+++ b/website/src/controllers/api-v3/tasks.js
@@ -304,24 +304,7 @@ api.updateTask = {
       throw new NotFound(res.t('taskNotFound'));
     }
 
-    // If reminders are updated -> replace the original ones
-    if (req.body.reminders) {
-      task.reminders = req.body.reminders;
-      delete req.body.reminders;
-    }
-
-    // If checklist is updated -> replace the original one
-    if (req.body.checklist) {
-      task.checklist = req.body.checklist;
-      delete req.body.checklist;
-    }
-
-    // If tags are updated -> replace the original ones
-    if (req.body.tags) {
-      task.tags = req.body.tags;
-      delete req.body.tags;
-    }
-
+    Tasks.Task.sanitize(req.body);
     // TODO we have to convert task to an object because otherwise things don't get merged correctly. Bad for performances?
     // TODO regarding comment above, make sure other models with nested fields are using this trick too
     _.assign(task, common.ops.updateTask(task.toObject(), req));
diff --git a/website/src/models/task.js b/website/src/models/task.js
index 66cd0ef524..1a6d201037 100644
--- a/website/src/models/task.js
+++ b/website/src/models/task.js
@@ -60,12 +60,6 @@ TaskSchema.statics.sanitizeCreate = function sanitizeCreate (createObj) {
   return this.sanitize(createObj, noCreate);
 };
 
-// A list of additional fields that cannot be updated (but can be set on creation)
-let noUpdate = ['_id', 'type'];
-TaskSchema.statics.sanitizeUpdate = function sanitizeUpdate (updateObj) {
-  return this.sanitize(updateObj, noUpdate);
-};
-
 // Sanitize checklist objects (disallowing _id)
 TaskSchema.statics.sanitizeChecklist = function sanitizeChecklist (checklistObj) {
   delete checklistObj._id;