diff --git a/lib/spec/openapi/utils.js b/lib/spec/openapi/utils.js
index 509e1561..f16e83ef 100644
--- a/lib/spec/openapi/utils.js
+++ b/lib/spec/openapi/utils.js
@@ -425,7 +425,7 @@ function prepareOpenapiSchemas (schemas, ref) {
       // swagger doesn't accept $id on components schemas
       // $ids are needed by ref.resolve to check the URI
       // definitions are added by resolve, but they are not needed, as we resolve
-      // the $ref to already existing schemas in components.schemas using method below, not the definition ones
+      // the $ref to already existing schemas in components.schemas using method below
       // therefore, we delete both $id and definitions at the end of the process
       delete resolvedRef.$id
       delete resolvedRef.definitions
diff --git a/test/spec/openapi/refs.js b/test/spec/openapi/refs.js
index 0481385f..4be5336e 100644
--- a/test/spec/openapi/refs.js
+++ b/test/spec/openapi/refs.js
@@ -290,6 +290,9 @@ test('support schema with definitions keyword and $ref inside', async (t) => {
   fastify.register(async (instance) => {
     instance.addSchema({
       $id: 'NestedSchema',
+      properties: {
+        id: { type: 'string' },
+      },
       definitions: {
         SchemaA: {
           type: 'object',
@@ -312,9 +315,11 @@ test('support schema with definitions keyword and $ref inside', async (t) => {
 
   const openapiObject = fastify.swagger()
   t.equal(typeof openapiObject, 'object')
+
+  // definitions are getting merged to properties
   t.match(Object.keys(openapiObject.components.schemas), ['NestedSchema'])
   t.match(Object.keys(openapiObject.components.schemas.NestedSchema), ['properties'])
-  t.match(Object.keys(openapiObject.components.schemas.NestedSchema.properties), ['SchemaA', 'SchemaB'])
+  t.match(Object.keys(openapiObject.components.schemas.NestedSchema.properties), ['id', 'SchemaA', 'SchemaB'])
 
   //  ref must be prefixed by '#/components/schemas/'
   t.equal(openapiObject.components.schemas.NestedSchema.properties.SchemaB.properties.example.$ref, '#/components/schemas/NestedSchema/properties/SchemaA')