diff --git a/zaqar/tests/unit/transport/wsgi/v1/test_claims.py b/zaqar/tests/unit/transport/wsgi/v1/test_claims.py
index 0a6316816..bd21111e8 100644
--- a/zaqar/tests/unit/transport/wsgi/v1/test_claims.py
+++ b/zaqar/tests/unit/transport/wsgi/v1/test_claims.py
@@ -182,7 +182,7 @@ class TestClaimsMongoDB(base.V1Base):
 
         self.assertEqual(60, claim['ttl'])
         estimated_age = timeutils.delta_seconds(creation, query)
-        self.assertTrue(estimated_age > claim['age'])
+        self.assertGreater(estimated_age, claim['age'])
 
         # Delete the claim
         self.simulate_delete(claim['href'], 'bad_id')
diff --git a/zaqar/tests/unit/transport/wsgi/v1_1/test_claims.py b/zaqar/tests/unit/transport/wsgi/v1_1/test_claims.py
index e4c57667d..83d9e36b8 100644
--- a/zaqar/tests/unit/transport/wsgi/v1_1/test_claims.py
+++ b/zaqar/tests/unit/transport/wsgi/v1_1/test_claims.py
@@ -233,7 +233,7 @@ class TestClaimsMongoDB(base.V1_1Base):
 
         self.assertEqual(60, claim['ttl'])
         estimated_age = timeutils.delta_seconds(creation, query)
-        self.assertTrue(estimated_age > claim['age'])
+        self.assertGreater(estimated_age, claim['age'])
 
         # Delete the claim
         self.simulate_delete(claim['href'], headers=self.headers)
diff --git a/zaqar/tests/unit/transport/wsgi/v2_0/test_claims.py b/zaqar/tests/unit/transport/wsgi/v2_0/test_claims.py
index 4e5043f4e..6087f7a84 100644
--- a/zaqar/tests/unit/transport/wsgi/v2_0/test_claims.py
+++ b/zaqar/tests/unit/transport/wsgi/v2_0/test_claims.py
@@ -234,7 +234,7 @@ class TestClaimsMongoDB(base.V2Base):
 
         self.assertEqual(60, claim['ttl'])
         estimated_age = timeutils.delta_seconds(creation, query)
-        self.assertTrue(estimated_age > claim['age'])
+        self.assertGreater(estimated_age, claim['age'])
 
         # Delete the claim
         self.simulate_delete(claim['href'], headers=self.headers)