diff --git a/openapi_core/schema/parameters.py b/openapi_core/schema/parameters.py
index 78d39db3..cfc5ca19 100644
--- a/openapi_core/schema/parameters.py
+++ b/openapi_core/schema/parameters.py
@@ -1,11 +1,20 @@
+from __future__ import division
+
+
 def get_aslist(param):
-    return (
-        param.get('schema', None) and
-        param['schema']['type'] in ['array', 'object']
-    )
+    """Checks if parameter is described as list for simpler scenarios"""
+    # if schema is not defined it's a complex scenario
+    if 'schema' not in param:
+        return False
+
+    param_schema = param / 'schema'
+    schema_type = param_schema.getkey('type', 'any')
+    # TODO: resolve for 'any' schema type
+    return schema_type in ['array', 'object']
 
 
 def get_style(param):
+    """Checks parameter style for simpler scenarios"""
     if 'style' in param:
         return param['style']
 
@@ -16,6 +25,7 @@ def get_style(param):
 
 
 def get_explode(param):
+    """Checks parameter explode for simpler scenarios"""
     if 'explode' in param:
         return param['explode']
 
diff --git a/tests/integration/data/v3.0/petstore.yaml b/tests/integration/data/v3.0/petstore.yaml
index 9db095bd..55813c4f 100644
--- a/tests/integration/data/v3.0/petstore.yaml
+++ b/tests/integration/data/v3.0/petstore.yaml
@@ -60,6 +60,13 @@ paths:
             items:
               type: integer
               format: int32
+        - name: order
+          in: query
+          schema:
+            oneOf:
+              - type: string
+              - type: integer
+                format: int32
         - name: tags
           in: query
           description: Filter pets with tags
diff --git a/tests/integration/validation/test_petstore.py b/tests/integration/validation/test_petstore.py
index 4992e336..56065395 100644
--- a/tests/integration/validation/test_petstore.py
+++ b/tests/integration/validation/test_petstore.py
@@ -365,6 +365,69 @@ def test_get_pets_none_value(self, spec):
 
         assert body is None
 
+    def test_get_pets_param_order(self, spec):
+        host_url = 'http://petstore.swagger.io/v1'
+        path_pattern = '/v1/pets'
+        query_params = {
+            'limit': None,
+            'order': 'desc',
+        }
+
+        request = MockRequest(
+            host_url, 'GET', '/pets',
+            path_pattern=path_pattern, args=query_params,
+        )
+
+        parameters = validate_parameters(spec, request)
+
+        assert parameters == RequestParameters(
+            query={
+                'limit': None,
+                'order': 'desc',
+                'page': 1,
+                'search': '',
+            }
+        )
+
+        body = validate_body(spec, request)
+
+        assert body is None
+
+    @pytest.mark.xfail(
+        reason="No parameters deserialization support for complex scenarios"
+    )
+    def test_get_pets_param_coordinates(self, spec):
+        host_url = 'http://petstore.swagger.io/v1'
+        path_pattern = '/v1/pets'
+        coordinates = {
+            'lat': 1.12,
+            'lon': 32.12,
+        }
+        query_params = {
+            'limit': None,
+            'coordinates': json.dumps(coordinates),
+        }
+
+        request = MockRequest(
+            host_url, 'GET', '/pets',
+            path_pattern=path_pattern, args=query_params,
+        )
+
+        parameters = validate_parameters(spec, request)
+
+        assert parameters == RequestParameters(
+            query={
+                'limit': None,
+                'page': 1,
+                'search': '',
+                'coordinates': coordinates,
+            }
+        )
+
+        body = validate_body(spec, request)
+
+        assert body is None
+
     def test_post_birds(self, spec, spec_dict):
         host_url = 'https://staging.gigantic-server.com/v1'
         path_pattern = '/v1/pets'