diff --git a/services/web/app/src/Features/Referal/ReferalController.js b/services/web/app/src/Features/Referal/ReferalController.js
index 8ca733305d..28160fa482 100644
--- a/services/web/app/src/Features/Referal/ReferalController.js
+++ b/services/web/app/src/Features/Referal/ReferalController.js
@@ -6,7 +6,7 @@ module.exports = {
     const userId = SessionManager.getLoggedInUserId(req.session)
     ReferalHandler.getReferedUsers(
       userId,
-      (err, referedUsers, referedUserCount) => {
+      (err, { referedUsers, referedUserCount }) => {
         if (err) {
           next(err)
         } else {
diff --git a/services/web/app/src/Features/Referal/ReferalHandler.js b/services/web/app/src/Features/Referal/ReferalHandler.js
index bcc60815dd..3a6092dd2b 100644
--- a/services/web/app/src/Features/Referal/ReferalHandler.js
+++ b/services/web/app/src/Features/Referal/ReferalHandler.js
@@ -1,15 +1,17 @@
+const { callbackify } = require('@overleaf/promise-utils')
 const { User } = require('../../models/User')
 
+async function getReferedUsers(userId) {
+  const projection = { refered_users: 1, refered_user_count: 1 }
+  const user = await User.findById(userId, projection).exec()
+  const referedUsers = user.refered_users || []
+  const referedUserCount = user.refered_user_count || referedUsers.length
+  return { referedUsers, referedUserCount }
+}
+
 module.exports = {
-  getReferedUsers(userId, callback) {
-    const projection = { refered_users: 1, refered_user_count: 1 }
-    User.findById(userId, projection, function (err, user) {
-      if (err) {
-        return callback(err)
-      }
-      const referedUsers = user.refered_users || []
-      const referedUserCount = user.refered_user_count || referedUsers.length
-      callback(null, referedUsers, referedUserCount)
-    })
+  getReferedUsers: callbackify(getReferedUsers),
+  promises: {
+    getReferedUsers,
   },
 }
diff --git a/services/web/test/unit/src/Referal/ReferalHandlerTests.js b/services/web/test/unit/src/Referal/ReferalHandlerTests.js
index 87caead125..3efd677e88 100644
--- a/services/web/test/unit/src/Referal/ReferalHandlerTests.js
+++ b/services/web/test/unit/src/Referal/ReferalHandlerTests.js
@@ -8,7 +8,11 @@ const modulePath = require('path').join(
 
 describe('Referal handler', function () {
   beforeEach(function () {
-    this.User = { findById: sinon.stub() }
+    this.User = {
+      findById: sinon.stub().returns({
+        exec: sinon.stub(),
+      }),
+    }
     this.handler = SandboxedModule.require(modulePath, {
       requires: {
         '../../models/User': {
@@ -20,73 +24,68 @@ describe('Referal handler', function () {
   })
 
   describe('getting refered user_ids', function () {
-    it('should get the user from mongo and return the refered users array', function (done) {
+    it('should get the user from mongo and return the refered users array', async function () {
       const user = {
         refered_users: ['1234', '312312', '3213129'],
         refered_user_count: 3,
       }
-      this.User.findById.callsArgWith(2, null, user)
-
-      this.handler.getReferedUsers(
-        this.user_id,
-        (err, passedReferedUserIds, passedReferedUserCount) => {
-          expect(err).not.to.exist
-          passedReferedUserIds.should.deep.equal(user.refered_users)
-          passedReferedUserCount.should.equal(3)
-          done()
-        }
-      )
-    })
-
-    it('should return an empty array if it is not set', function (done) {
-      const user = {}
-      this.User.findById.callsArgWith(2, null, user)
-
-      this.handler.getReferedUsers(
-        this.user_id,
-        (err, passedReferedUserIds, passedReferedUserCount) => {
-          expect(err).not.to.exist
-          passedReferedUserIds.length.should.equal(0)
-          done()
-        }
-      )
-    })
-
-    it('should return a zero count if neither it or the array are set', function (done) {
-      const user = {}
-      this.User.findById.callsArgWith(2, null, user)
-
-      this.handler.getReferedUsers(
-        this.user_id,
-        (err, passedReferedUserIds, passedReferedUserCount) => {
-          expect(err).not.to.exist
-          passedReferedUserCount.should.equal(0)
-          done()
-        }
-      )
-    })
-
-    it('should return the array length if count is not set', function (done) {
-      const user = { refered_users: ['1234', '312312', '3213129'] }
-      this.User.findById.callsArgWith(2, null, user)
-
-      this.handler.getReferedUsers(
-        this.user_id,
-        (err, passedReferedUserIds, passedReferedUserCount) => {
-          expect(err).not.to.exist
-          passedReferedUserCount.should.equal(3)
-          done()
-        }
-      )
-    })
-
-    it('should error if finding the user fails', function (done) {
-      this.User.findById.callsArgWith(2, new Error('user not found'))
-
-      this.handler.getReferedUsers(this.user_id, err => {
-        err.should.match(/user not found/)
-        done()
+      this.User.findById.returns({
+        exec: sinon.stub().resolves(user),
       })
+
+      const {
+        referedUsers: passedReferedUserIds,
+        referedUserCount: passedReferedUserCount,
+      } = await this.handler.promises.getReferedUsers(this.user_id)
+
+      passedReferedUserIds.should.deep.equal(user.refered_users)
+      passedReferedUserCount.should.equal(3)
+    })
+
+    it('should return an empty array if it is not set', async function () {
+      const user = {}
+      this.User.findById.returns({
+        exec: sinon.stub().resolves(user),
+      })
+
+      const { referedUsers: passedReferedUserIds } =
+        await this.handler.promises.getReferedUsers(this.user_id)
+
+      passedReferedUserIds.length.should.equal(0)
+    })
+
+    it('should return a zero count if neither it or the array are set', async function () {
+      const user = {}
+      this.User.findById.returns({
+        exec: sinon.stub().resolves(user),
+      })
+
+      const { referedUserCount: passedReferedUserCount } =
+        await this.handler.promises.getReferedUsers(this.user_id)
+
+      passedReferedUserCount.should.equal(0)
+    })
+
+    it('should return the array length if count is not set', async function () {
+      const user = { refered_users: ['1234', '312312', '3213129'] }
+      this.User.findById.returns({
+        exec: sinon.stub().resolves(user),
+      })
+
+      const { referedUserCount: passedReferedUserCount } =
+        await this.handler.promises.getReferedUsers(this.user_id)
+
+      passedReferedUserCount.should.equal(3)
+    })
+
+    it('should error if finding the user fails', async function () {
+      this.User.findById.returns({
+        exec: sinon.stub().rejects(new Error('user not found')),
+      })
+
+      expect(
+        this.handler.promises.getReferedUsers(this.user_id)
+      ).to.be.rejectedWith('user not found')
     })
   })
 })