diff --git a/src/middlewares/openapi.request.validator.ts b/src/middlewares/openapi.request.validator.ts
index 734502b9..82b0b7f7 100644
--- a/src/middlewares/openapi.request.validator.ts
+++ b/src/middlewares/openapi.request.validator.ts
@@ -343,6 +343,16 @@ export class RequestValidator {
       if (parameter.content && parameter.content[TYPE_JSON]) {
         parameterSchema = parameter.content[TYPE_JSON].schema;
         parseJson.push({ name, reqField });
+      } else if (
+        // handle complex json types in schema
+        $in === 'query' &&
+        (parameterSchema.allOf ||
+          parameterSchema.oneOf ||
+          parameterSchema.anyOf ||
+          (parameterSchema.type === 'object' &&
+            parameterSchema.type !== 'array'))
+      ) {
+        parseJson.push({ name, reqField });
       }
 
       if (!parameterSchema) {
diff --git a/test/resources/serialized.objects.yaml b/test/resources/serialized.objects.yaml
new file mode 100644
index 00000000..96557eb1
--- /dev/null
+++ b/test/resources/serialized.objects.yaml
@@ -0,0 +1,52 @@
+
+openapi: '3.0.2'
+info:
+  version: 1.0.0
+  title: requestBodies $ref
+  description: requestBodies $ref Test
+
+servers:
+  - url: /v1/
+  
+paths:
+  /serialisable:
+    get:
+      summary: "Retrieve something"
+      parameters:
+        - in: query
+          style: form
+          name: settings
+          explode: true
+          schema:
+            allOf:
+              - type: object
+                properties:
+                  onlyValidated:
+                    type: boolean
+                    default: true
+                  onlySelected:
+                    type: array
+                    default: []
+                    uniqueItems: true
+                    items:
+                      type: integer
+                      minimum: 0
+                      example: 42
+      responses:
+        '200':
+          description: "An array of items"
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/someItem"
+                uniqueItems: true
+                
+components:
+  schemas:
+    someItem:
+      type: object
+      properties:
+        id:
+          type: string
\ No newline at end of file
diff --git a/test/serialized.objects.spec.ts b/test/serialized.objects.spec.ts
new file mode 100644
index 00000000..192f10c1
--- /dev/null
+++ b/test/serialized.objects.spec.ts
@@ -0,0 +1,34 @@
+import * as path from 'path';
+import * as express from 'express';
+import * as request from 'supertest';
+import * as packageJson from '../package.json';
+import { createApp } from './common/app';
+
+describe(packageJson.name, () => {
+  let app = null;
+
+  before(async () => {
+    // Set up the express app
+    const apiSpec = path.join('test', 'resources', 'serialized.objects.yaml');
+    app = await createApp({ apiSpec }, 3005, app =>
+      app.use(
+        `${app.basePath}`,
+        express
+          .Router()
+          .get(`/serialisable`, (req, res) => res.json({ id: 'test' })),
+      ),
+    );
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  it('should deserialize object', async () =>
+    request(app)
+      .get(`${app.basePath}/serialisable`)
+      .query({
+        settings: '{"onlyValidated":true}',
+      })
+      .expect(200));
+});