diff --git a/openapi_core/__init__.py b/openapi_core/__init__.py
index 8d7ddfe..8f63118 100644
--- a/openapi_core/__init__.py
+++ b/openapi_core/__init__.py
@@ -6,7 +6,7 @@ from openapi_core.shortcuts import (
 
 __author__ = 'Artur Maciag'
 __email__ = 'maciag.artur@gmail.com'
-__version__ = '0.8.0'
+__version__ = '0.8.1'
 __url__ = 'https://github.com/p1c2u/openapi-core'
 __license__ = 'BSD 3-Clause License'
 
diff --git a/openapi_core/schema/schemas/factories.py b/openapi_core/schema/schemas/factories.py
index 50f04ba..136fbd0 100644
--- a/openapi_core/schema/schemas/factories.py
+++ b/openapi_core/schema/schemas/factories.py
@@ -28,7 +28,8 @@ class SchemaFactory(object):
         deprecated = schema_deref.get('deprecated', False)
         all_of_spec = schema_deref.get('allOf', None)
         one_of_spec = schema_deref.get('oneOf', None)
-        additional_properties_spec = schema_deref.get('additionalProperties')
+        additional_properties_spec = schema_deref.get('additionalProperties',
+                                                      True)
         min_items = schema_deref.get('minItems', None)
         max_items = schema_deref.get('maxItems', None)
         min_length = schema_deref.get('minLength', None)
@@ -59,8 +60,8 @@ class SchemaFactory(object):
         if items_spec:
             items = self._create_items(items_spec)
 
-        additional_properties = None
-        if additional_properties_spec:
+        additional_properties = additional_properties_spec
+        if isinstance(additional_properties_spec, dict):
             additional_properties = self.create(additional_properties_spec)
 
         return Schema(
diff --git a/openapi_core/schema/schemas/models.py b/openapi_core/schema/schemas/models.py
index 6ae4dc9..65c8bc8 100644
--- a/openapi_core/schema/schemas/models.py
+++ b/openapi_core/schema/schemas/models.py
@@ -68,7 +68,7 @@ class Schema(object):
             self, schema_type=None, model=None, properties=None, items=None,
             schema_format=None, required=None, default=None, nullable=False,
             enum=None, deprecated=False, all_of=None, one_of=None,
-            additional_properties=None, min_items=None, max_items=None,
+            additional_properties=True, min_items=None, max_items=None,
             min_length=None, max_length=None, pattern=None, unique_items=False,
             minimum=None, maximum=None, multiple_of=None,
             exclusive_minimum=False, exclusive_maximum=False,
@@ -284,14 +284,15 @@ class Schema(object):
 
         value_props_names = value.keys()
         extra_props = set(value_props_names) - set(all_props_names)
-        if extra_props and self.additional_properties is None:
+        if extra_props and self.additional_properties is False:
             raise UndefinedSchemaProperty(extra_props)
 
         properties = {}
-        for prop_name in extra_props:
-            prop_value = value[prop_name]
-            properties[prop_name] = self.additional_properties.unmarshal(
-                prop_value, custom_formatters=custom_formatters)
+        if self.additional_properties is not True:
+            for prop_name in extra_props:
+                prop_value = value[prop_name]
+                properties[prop_name] = self.additional_properties.unmarshal(
+                    prop_value, custom_formatters=custom_formatters)
 
         for prop_name, prop in iteritems(all_props):
             try:
@@ -515,13 +516,14 @@ class Schema(object):
 
         value_props_names = value.keys()
         extra_props = set(value_props_names) - set(all_props_names)
-        if extra_props and self.additional_properties is None:
+        if extra_props and self.additional_properties is False:
             raise UndefinedSchemaProperty(extra_props)
 
-        for prop_name in extra_props:
-            prop_value = value[prop_name]
-            self.additional_properties.validate(
-                prop_value, custom_formatters=custom_formatters)
+        if self.additional_properties is not True:
+            for prop_name in extra_props:
+                prop_value = value[prop_name]
+                self.additional_properties.validate(
+                    prop_value, custom_formatters=custom_formatters)
 
         for prop_name, prop in iteritems(all_props):
             try:
diff --git a/tests/integration/data/v3.0/petstore.yaml b/tests/integration/data/v3.0/petstore.yaml
index 3f132c3..ed623a3 100644
--- a/tests/integration/data/v3.0/petstore.yaml
+++ b/tests/integration/data/v3.0/petstore.yaml
@@ -295,6 +295,7 @@ components:
           $ref: "#/components/schemas/Utctime"
         name:
           type: string
+      additionalProperties: false
     TagList:
       type: array
       items:
diff --git a/tests/unit/schema/test_schemas.py b/tests/unit/schema/test_schemas.py
index 302719f..cab5fdf 100644
--- a/tests/unit/schema/test_schemas.py
+++ b/tests/unit/schema/test_schemas.py
@@ -7,6 +7,7 @@ import pytest
 from openapi_core.extensions.models.models import Model
 from openapi_core.schema.schemas.exceptions import (
     InvalidSchemaValue, MultipleOneOfSchema, NoOneOfSchema, OpenAPISchemaError,
+    UndefinedSchemaProperty
 )
 from openapi_core.schema.schemas.models import Schema
 
@@ -697,6 +698,26 @@ class TestSchemaValidate(object):
 
         assert result == value
 
+    @pytest.mark.parametrize('value', [Model({'additional': 1}), ])
+    def test_object_additional_propetries(self, value):
+        schema = Schema('object')
+
+        schema.validate(value)
+
+    @pytest.mark.parametrize('value', [Model({'additional': 1}), ])
+    def test_object_additional_propetries_false(self, value):
+        schema = Schema('object', additional_properties=False)
+
+        with pytest.raises(UndefinedSchemaProperty):
+            schema.validate(value)
+
+    @pytest.mark.parametrize('value', [Model({'additional': 1}), ])
+    def test_object_additional_propetries_object(self, value):
+        additional_properties = Schema('integer')
+        schema = Schema('object', additional_properties=additional_properties)
+
+        schema.validate(value)
+
     @pytest.mark.parametrize('value', [[], ])
     def test_list_min_items_invalid_schema(self, value):
         schema = Schema(