diff --git a/src/test/integration/controllers/cooperation.spec.js b/src/test/integration/controllers/cooperation.spec.js
index e8a83881..efa18596 100644
--- a/src/test/integration/controllers/cooperation.spec.js
+++ b/src/test/integration/controllers/cooperation.spec.js
@@ -243,9 +243,7 @@ describe('Cooperation controller', () => {
       expect(Array.isArray(response.body.items)).toBe(true)
       expect(response.body.items[0]).toMatchObject({
         _id: testCooperation._body._id,
-        offer: {
-          _id: testOffer._id
-        },
+        offer: testOffer._id,
         initiator: testStudentUser.id,
         receiver: testTutorUser._id,
         proficiencyLevel: testCooperationData.proficiencyLevel,