diff --git a/openapi_core/unmarshalling/schemas/unmarshallers.py b/openapi_core/unmarshalling/schemas/unmarshallers.py
index 5f924d4..25b1aff 100644
--- a/openapi_core/unmarshalling/schemas/unmarshallers.py
+++ b/openapi_core/unmarshalling/schemas/unmarshallers.py
@@ -157,9 +157,16 @@ class ObjectUnmarshaller(ComplexUnmarshaller):
     def model_factory(self):
         return ModelFactory()
 
-    def __call__(self, value=NoValue):
-        value = super(ObjectUnmarshaller, self).__call__(value)
+    def unmarshal(self, value):
+        try:
+            value = self.formatter.unmarshal(value)
+        except ValueError as exc:
+            raise InvalidSchemaFormatValue(
+                value, self.schema.format, exc)
+        else:
+            return self._unmarshal_object(value)
 
+    def _unmarshal_object(self, value=NoValue):
         if self.schema.one_of:
             properties = None
             for one_of_schema in self.schema.one_of:
diff --git a/tests/unit/unmarshalling/test_unmarshal.py b/tests/unit/unmarshalling/test_unmarshal.py
index e8c7609..8c58809 100644
--- a/tests/unit/unmarshalling/test_unmarshal.py
+++ b/tests/unit/unmarshalling/test_unmarshal.py
@@ -408,6 +408,18 @@ class TestSchemaUnmarshallerCall(object):
 
         assert result == 1.2
 
+    def test_object_nullable(self, unmarshaller_factory):
+        schema = Schema(
+            'object',
+            properties={
+                'foo': Schema('object', nullable=True),
+            },
+        )
+        value = {'foo': None}
+        result = unmarshaller_factory(schema)(value)
+
+        assert result == {'foo': None}
+
     def test_schema_any_one_of(self, unmarshaller_factory):
         schema = Schema(one_of=[
             Schema('string'),