diff --git a/e2e-tests/e2eTest.spec.ts b/e2e-tests/e2eTest.spec.ts
index b38fe9d..6ea026c 100644
--- a/e2e-tests/e2eTest.spec.ts
+++ b/e2e-tests/e2eTest.spec.ts
@@ -43,7 +43,7 @@ void describe('e2e-tests', () => {
 		}
 		const responseBody = await req.json()
 		assert.equal(req.status, 400)
-		assert.equal(req.headers.get('Content-Type'), '')
+		assert.equal(req.headers.get('Content-Type'), 'application/problem+json')
 		assert.deepEqual(responseBody, expectedBody)
 	})
 	void it('should return a problem details message that describes the reason for the 400 error when not valid iccid', async () => {
@@ -60,7 +60,7 @@ void describe('e2e-tests', () => {
 		}
 		const responseBody = await req.json()
 		assert.equal(req.status, 400)
-		assert.equal(req.headers.get('Content-Type'), '')
+		assert.equal(req.headers.get('Content-Type'), 'application/problem+json')
 		assert.deepEqual(responseBody, expectedBody)
 	})
 	void it('should return statusCode 409 and cache max-age=60 when the SIM information is not in DB', async () => {