diff --git a/django/db/backends/oracle/schema.py b/django/db/backends/oracle/schema.py
index 986cd95e75..702b3791d0 100644
--- a/django/db/backends/oracle/schema.py
+++ b/django/db/backends/oracle/schema.py
@@ -24,8 +24,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
             return "'%s'" % value
         elif isinstance(value, six.string_types):
             return "'%s'" % six.text_type(value).replace("\'", "\'\'")
-        elif (isinstance(value, six.memoryview) or
-              six.PY3 and isinstance(value, bytes)):
+        elif isinstance(value, six.buffer_types):
             return "'%s'" % force_text(binascii.hexlify(value))
         elif isinstance(value, bool):
             return "1" if value else "0"
diff --git a/django/utils/six.py b/django/utils/six.py
index bf94a83000..8c582deaac 100644
--- a/django/utils/six.py
+++ b/django/utils/six.py
@@ -666,6 +666,7 @@ if PY3:
     _assertRaisesRegex = "assertRaisesRegex"
     _assertRegex = "assertRegex"
     memoryview = memoryview
+    buffer_types = (bytes, bytearray, memoryview)
 else:
     _assertRaisesRegex = "assertRaisesRegexp"
     _assertRegex = "assertRegexpMatches"
@@ -676,6 +677,7 @@ else:
         memoryview = memoryview
     else:
         memoryview = buffer
+    buffer_types = (bytearray, memoryview)
 
 
 def assertRaisesRegex(self, *args, **kwargs):