diff --git a/tempest/lib/common/rest_client.py b/tempest/lib/common/rest_client.py
index d001d27..af19835 100644
--- a/tempest/lib/common/rest_client.py
+++ b/tempest/lib/common/rest_client.py
@@ -220,6 +220,10 @@
         :raises exceptions.InvalidHttpSuccessCode: if the read code isn't an
                                                    expected http success code
         """
+        if not isinstance(read_code, int):
+            raise TypeError("'read_code' must be an int instead of (%s)"
+                            % type(read_code))
+
         assert_msg = ("This function only allowed to use for HTTP status"
                       "codes which explicitly defined in the RFC 7231 & 4918."
                       "{0} is not a defined Success Code!"
diff --git a/tempest/tests/lib/test_rest_client.py b/tempest/tests/lib/test_rest_client.py
index 90651b0..ca2c201 100644
--- a/tempest/tests/lib/test_rest_client.py
+++ b/tempest/tests/lib/test_rest_client.py
@@ -636,6 +636,24 @@
         self.assertRaises(AssertionError, self.rest_client.expected_success,
                           expected_code, read_code)
 
+    def test_non_success_read_code_as_string(self):
+        expected_code = 202
+        read_code = '202'
+        self.assertRaises(TypeError, self.rest_client.expected_success,
+                          expected_code, read_code)
+
+    def test_non_success_read_code_as_list(self):
+        expected_code = 202
+        read_code = [202]
+        self.assertRaises(TypeError, self.rest_client.expected_success,
+                          expected_code, read_code)
+
+    def test_non_success_expected_code_as_non_int(self):
+        expected_code = ['201', 202]
+        read_code = 202
+        self.assertRaises(AssertionError, self.rest_client.expected_success,
+                          expected_code, read_code)
+
 
 class TestResponseBody(base.TestCase):