diff --git a/openapi_core/unmarshalling/unmarshallers.py b/openapi_core/unmarshalling/unmarshallers.py
index ddc8b891..984b9ea1 100644
--- a/openapi_core/unmarshalling/unmarshallers.py
+++ b/openapi_core/unmarshalling/unmarshallers.py
@@ -60,7 +60,8 @@ def __init__(
             schema_validators_factory = (
                 schema_unmarshallers_factory.schema_validators_factory
             )
-        super().__init__(
+        BaseValidator.__init__(
+            self,
             spec,
             base_url=base_url,
             style_deserializers_factory=style_deserializers_factory,
diff --git a/openapi_core/validation/request/validators.py b/openapi_core/validation/request/validators.py
index 34e23ecd..f2e1ae95 100644
--- a/openapi_core/validation/request/validators.py
+++ b/openapi_core/validation/request/validators.py
@@ -84,7 +84,9 @@ def __init__(
         ] = None,
         security_provider_factory: SecurityProviderFactory = security_provider_factory,
     ):
-        super().__init__(
+
+        BaseValidator.__init__(
+            self,
             spec,
             base_url=base_url,
             style_deserializers_factory=style_deserializers_factory,
diff --git a/tests/unit/unmarshalling/test_request_unmarshallers.py b/tests/unit/unmarshalling/test_request_unmarshallers.py
new file mode 100644
index 00000000..a407d567
--- /dev/null
+++ b/tests/unit/unmarshalling/test_request_unmarshallers.py
@@ -0,0 +1,136 @@
+import enum
+
+import pytest
+from jsonschema_path import SchemaPath
+
+from openapi_core import V30RequestUnmarshaller
+from openapi_core import V31RequestUnmarshaller
+from openapi_core.datatypes import Parameters
+from openapi_core.testing import MockRequest
+
+
+class Colors(enum.Enum):
+
+    YELLOW = "yellow"
+    BLUE = "blue"
+    RED = "red"
+
+    @classmethod
+    def of(cls, v: str):
+        for it in cls:
+            if it.value == v:
+                return it
+        raise ValueError(f"Invalid value: {v}")
+
+
+class TestRequestUnmarshaller:
+
+    @pytest.fixture(scope="session")
+    def spec_dict(self):
+        return {
+            "openapi": "3.1.0",
+            "info": {
+                "title": "Test request body unmarshaller",
+                "version": "0.1",
+            },
+            "paths": {
+                "/resources": {
+                    "post": {
+                        "description": "POST resources test request",
+                        "requestBody": {
+                            "description": "",
+                            "content": {
+                                "application/json": {
+                                    "schema": {
+                                        "$ref": "#/components/schemas/createResource"
+                                    }
+                                }
+                            },
+                        },
+                        "responses": {
+                            "201": {"description": "Resource was created."}
+                        },
+                    },
+                    "get": {
+                        "description": "POST resources test request",
+                        "parameters": [
+                            {
+                                "name": "color",
+                                "in": "query",
+                                "required": False,
+                                "schema": {
+                                    "$ref": "#/components/schemas/colors"
+                                },
+                            },
+                        ],
+                        "responses": {
+                            "default": {
+                                "description": "Returned resources matching request."
+                            }
+                        },
+                    },
+                }
+            },
+            "components": {
+                "schemas": {
+                    "colors": {
+                        "type": "string",
+                        "enum": ["yellow", "blue", "red"],
+                        "format": "enum_Colors",
+                    },
+                    "createResource": {
+                        "type": "object",
+                        "properties": {
+                            "resId": {"type": "integer"},
+                            "color": {"$ref": "#/components/schemas/colors"},
+                        },
+                        "required": ["resId", "color"],
+                    },
+                }
+            },
+        }
+
+    @pytest.fixture(scope="session")
+    def spec(self, spec_dict):
+        return SchemaPath.from_dict(spec_dict)
+
+    @pytest.mark.parametrize(
+        "req_unmarshaller_cls",
+        [V30RequestUnmarshaller, V31RequestUnmarshaller],
+    )
+    def test_request_body_extra_unmarshaller(self, spec, req_unmarshaller_cls):
+        ru = req_unmarshaller_cls(
+            spec=spec, extra_format_unmarshallers={"enum_Colors": Colors.of}
+        )
+        request = MockRequest(
+            host_url="http://example.com",
+            method="post",
+            path="/resources",
+            data=b'{"resId": 23498572, "color": "blue"}',
+        )
+        result = ru.unmarshal(request)
+
+        assert not result.errors
+        assert result.body == {"resId": 23498572, "color": Colors.BLUE}
+        assert result.parameters == Parameters()
+
+    @pytest.mark.parametrize(
+        "req_unmarshaller_cls",
+        [V30RequestUnmarshaller, V31RequestUnmarshaller],
+    )
+    def test_request_param_extra_unmarshaller(
+        self, spec, req_unmarshaller_cls
+    ):
+        ru = req_unmarshaller_cls(
+            spec=spec, extra_format_unmarshallers={"enum_Colors": Colors.of}
+        )
+        request = MockRequest(
+            host_url="http://example.com",
+            method="get",
+            path="/resources",
+            args={"color": "blue"},
+        )
+        result = ru.unmarshal(request)
+
+        assert not result.errors
+        assert result.parameters == Parameters(query=dict(color=Colors.BLUE))