diff --git a/src/tarantool/response.py b/src/tarantool/response.py
index 35627f6d..ba33d35a 100644
--- a/src/tarantool/response.py
+++ b/src/tarantool/response.py
@@ -25,7 +25,7 @@ def __new__(cls, value):
         if isinstance(value, unicode):
             return super(field, cls).__new__(cls, value.encode("utf-8", "replace"))
 
-        if sys.version_info.major < 3 and isinstance(value, str):
+        if sys.version_info[0] < 3 and isinstance(value, str):
             return super(field, cls).__new__(cls, value)
 
         if isinstance(value, (bytearray, bytes)):
@@ -57,7 +57,7 @@ def __int__(self):
             raise ValueError("Unable to cast field to int: length must be 4 or 8 bytes, field length is %d"%len(self))
 
 
-    if sys.version_info.major > 2:
+    if sys.version_info[0] > 2:
         def __str__(self):
             '''\
             Cast filed to str
diff --git a/src/tarantool/schema.py b/src/tarantool/schema.py
index bfe42443..a1e17f02 100644
--- a/src/tarantool/schema.py
+++ b/src/tarantool/schema.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 ### pylint: disable=C0301,W0105,W0401,W0614
 '''
-This module provides :class:`~tarantool.schema.Schema` class. 
+This module provides :class:`~tarantool.schema.Schema` class.
 It is a Tarantool schema description.
 '''
 
@@ -245,7 +245,7 @@ def pack_value(self, value, cast_to = None):
                 if value > 4294967295:
                     return self._pack_value_int64(value)
                 else:
-                    return self.pack_value_int(value)
+                    return self._pack_value_int(value)
             elif isinstance(value, long):
                 return self._pack_value_int64(value)
             else: