diff --git a/tempest/api/identity/admin/v3/test_credentials.py b/tempest/api/identity/admin/v3/test_credentials.py
index 12b236f..a0d8748 100644
--- a/tempest/api/identity/admin/v3/test_credentials.py
+++ b/tempest/api/identity/admin/v3/test_credentials.py
@@ -12,6 +12,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+from oslo_serialization import jsonutils as json
 
 from tempest.api.identity import base
 from tempest.common.utils import data_utils
@@ -70,6 +71,7 @@
         update_body = self.creds_client.update_credential(
             cred['id'], blob=blob, project_id=self.projects[1],
             type='ec2')['credential']
+        update_body['blob'] = json.loads(update_body['blob'])
         self.assertEqual(cred['id'], update_body['id'])
         self.assertEqual(self.projects[1], update_body['project_id'])
         self.assertEqual(self.user_body['id'], update_body['user_id'])
@@ -77,6 +79,7 @@
         self.assertEqual(update_body['blob']['secret'], new_keys[1])
 
         get_body = self.creds_client.show_credential(cred['id'])['credential']
+        get_body['blob'] = json.loads(get_body['blob'])
         for value1 in self.creds_list[0]:
             self.assertEqual(update_body[value1],
                              get_body[value1])
diff --git a/tempest/lib/services/identity/v3/credentials_client.py b/tempest/lib/services/identity/v3/credentials_client.py
index c063cae..b259416 100644
--- a/tempest/lib/services/identity/v3/credentials_client.py
+++ b/tempest/lib/services/identity/v3/credentials_client.py
@@ -36,7 +36,6 @@
         resp, body = self.post('credentials', post_body)
         self.expected_success(201, resp.status)
         body = json.loads(body)
-        body['credential']['blob'] = json.loads(body['credential']['blob'])
         return rest_client.ResponseBody(resp, body)
 
     def update_credential(self, credential_id, **kwargs):
@@ -49,7 +48,6 @@
         resp, body = self.patch('credentials/%s' % credential_id, post_body)
         self.expected_success(200, resp.status)
         body = json.loads(body)
-        body['credential']['blob'] = json.loads(body['credential']['blob'])
         return rest_client.ResponseBody(resp, body)
 
     def show_credential(self, credential_id):
@@ -62,7 +60,6 @@
         resp, body = self.get('credentials/%s' % credential_id)
         self.expected_success(200, resp.status)
         body = json.loads(body)
-        body['credential']['blob'] = json.loads(body['credential']['blob'])
         return rest_client.ResponseBody(resp, body)
 
     def list_credentials(self, **params):
diff --git a/tempest/tests/lib/services/base.py b/tempest/tests/lib/services/base.py
index 3165689..a244aa2 100644
--- a/tempest/tests/lib/services/base.py
+++ b/tempest/tests/lib/services/base.py
@@ -12,7 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import copy
 from oslo_serialization import jsonutils as json
 from oslotest import mockpatch
 
@@ -32,7 +31,7 @@
 
     def check_service_client_function(self, function, function2mock,
                                       body, to_utf=False, status=200,
-                                      headers=None, cr_blob=False, **kwargs):
+                                      headers=None, **kwargs):
         mocked_response = self.create_response(body, to_utf, status, headers)
         self.useFixture(mockpatch.Patch(
             function2mock, return_value=mocked_response))
@@ -40,11 +39,4 @@
             resp = function(**kwargs)
         else:
             resp = function()
-
-        if cr_blob:
-            evaluated_body = copy.deepcopy(body)
-            nested_json = json.loads(evaluated_body['credential']['blob'])
-            evaluated_body['credential']['blob'] = nested_json
-            self.assertEqual(evaluated_body, resp)
-        else:
-            self.assertEqual(body, resp)
+        self.assertEqual(body, resp)
diff --git a/tempest/tests/lib/services/identity/v3/test_credentials_client.py b/tempest/tests/lib/services/identity/v3/test_credentials_client.py
index a2a22ff..29d7496 100644
--- a/tempest/tests/lib/services/identity/v3/test_credentials_client.py
+++ b/tempest/tests/lib/services/identity/v3/test_credentials_client.py
@@ -121,14 +121,14 @@
             self.client.create_credential,
             'tempest.lib.common.rest_client.RestClient.post',
             self.FAKE_CREATE_CREDENTIAL,
-            bytes_body, status=201, cr_blob=True)
+            bytes_body, status=201)
 
     def _test_show_credential(self, bytes_body=False):
         self.check_service_client_function(
             self.client.show_credential,
             'tempest.lib.common.rest_client.RestClient.get',
             self.FAKE_INFO_CREDENTIAL,
-            bytes_body, cr_blob=True,
+            bytes_body,
             credential_id="207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f")
 
     def _test_update_credential(self, bytes_body=False):
@@ -136,7 +136,7 @@
             self.client.update_credential,
             'tempest.lib.common.rest_client.RestClient.patch',
             self.FAKE_INFO_CREDENTIAL,
-            bytes_body, cr_blob=True,
+            bytes_body,
             credential_id="207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f")
 
     def _test_list_credentials(self, bytes_body=False):