diff --git a/sahara/tests/unit/service/validation/test_ng_template_validation_create.py b/sahara/tests/unit/service/validation/test_ng_template_validation_create.py
index 518e086d..029f0618 100644
--- a/sahara/tests/unit/service/validation/test_ng_template_validation_create.py
+++ b/sahara/tests/unit/service/validation/test_ng_template_validation_create.py
@@ -67,7 +67,7 @@ class TestNGTemplateCreateValidation(u.ValidationTestCase):
                 'node_processes': []
             },
             bad_req_i=(1, 'VALIDATION_ERROR',
-                       u'[] is too short')
+                       u'\[\] is too short')
         )
 
     def test_ng_template_create_v_names(self):
@@ -142,7 +142,7 @@ class TestNGTemplateCreateValidation(u.ValidationTestCase):
                 'volumes_per_node': -1
             },
             bad_req_i=(1, 'VALIDATION_ERROR',
-                       u'-1.0 is less than the minimum of 0')
+                       u'-1(.0)? is less than the minimum of 0')
         )
         self._assert_create_object_validation(
             data={
@@ -154,7 +154,7 @@ class TestNGTemplateCreateValidation(u.ValidationTestCase):
                 'volumes_size': 0
             },
             bad_req_i=(1, 'VALIDATION_ERROR',
-                       u'0.0 is less than the minimum of 1')
+                       u'0(.0)? is less than the minimum of 1')
         )
 
     def test_ng_template_create_v_types(self):
@@ -238,7 +238,7 @@ class TestNGTemplateCreateValidation(u.ValidationTestCase):
                 'volumes_per_node': -1
             },
             bad_req_i=(1, 'VALIDATION_ERROR',
-                       u'-1.0 is less than the minimum of 0')
+                       u'-1(.0)? is less than the minimum of 0')
         )
         self._assert_create_object_validation(
             data={
@@ -250,7 +250,7 @@ class TestNGTemplateCreateValidation(u.ValidationTestCase):
                 'volumes_size': 0
             },
             bad_req_i=(1, 'VALIDATION_ERROR',
-                       u'0.0 is less than the minimum of 1')
+                       u'0(.0)? is less than the minimum of 1')
         )
         self._assert_create_object_validation(
             data={
diff --git a/sahara/tests/unit/service/validation/utils.py b/sahara/tests/unit/service/validation/utils.py
index 6b40d239..736473ec 100644
--- a/sahara/tests/unit/service/validation/utils.py
+++ b/sahara/tests/unit/service/validation/utils.py
@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import re
+
 import mock
 import novaclient.exceptions as nova_ex
 
@@ -255,7 +257,14 @@ class ValidationTestCase(base.SaharaTestCase):
         else:
             self.assertEqual(mock.call_count, call_info[0])
             self.assertEqual(mock.call_args[0][0].code, call_info[1])
-            self.assertEqual(mock.call_args[0][0].message, call_info[2])
+
+            # Note(slukjanov): the call_info[2] is an expected validation
+            #                  message regex; regex needed because of different
+            #                  versions of jsonschema generates different
+            #                  messages.
+            if not re.match(call_info[2], mock.call_args[0][0].message):
+                self.assertEqual(call_info[2], mock.call_args[0][0].message,
+                                 "Validation message didn't match expected")
 
     @mock.patch("sahara.utils.api.request_data")
     @mock.patch("sahara.utils.api.bad_request")