diff --git a/src/ObjectSchema.js b/src/ObjectSchema.js
index dc94852..26bf978 100644
--- a/src/ObjectSchema.js
+++ b/src/ObjectSchema.js
@@ -45,10 +45,11 @@ const ObjectSchema = ({ schema = initialState, ...options } = {}) => {
      * @param {string} id - an #id
      **/
     id: id => {
-      if (!id)
+      if (!id) {
         throw new FluentSchemaError(
-          `id should not be an empty fragment <#> or an empty string <> (e.g. #myId)`
+          'id should not be an empty fragment <#> or an empty string <> (e.g. #myId)'
         )
+      }
       return options.factory({ schema: { ...schema, $id: id }, ...options })
     },
     /**
@@ -277,8 +278,10 @@ const ObjectSchema = ({ schema = initialState, ...options } = {}) => {
       }
       const target = props.def ? 'definitions' : 'properties'
       let attributes = props.valueOf({ isRoot: false })
+
+      const { $ref, $id: attributeId, required, ...restAttributes } = attributes
       const $id =
-        attributes.$id ||
+        attributeId ||
         (options.generateIds ? `#${target}/${name}` : undefined)
       if (isFluentSchema(props)) {
         attributes = patchIdsWithParentId({
@@ -303,8 +306,6 @@ const ObjectSchema = ({ schema = initialState, ...options } = {}) => {
         ? undefined
         : attributes.type
 
-      const $ref = attributes.$ref
-
       // strip undefined values or empty arrays or internals
       attributes = Object.entries({ ...attributes, $id, type }).reduce(
         (memo, [key, value]) => {
@@ -323,7 +324,7 @@ const ObjectSchema = ({ schema = initialState, ...options } = {}) => {
           ...schema,
           [target]: [
             ...schema[target],
-            $ref ? { name, $ref } : Object.assign({}, { name }, attributes)
+            $ref ? { name, $ref, ...restAttributes } : { name, ...attributes }
           ]
         },
         ...options
diff --git a/src/ObjectSchema.test.js b/src/ObjectSchema.test.js
index 674d860..45b227d 100644
--- a/src/ObjectSchema.test.js
+++ b/src/ObjectSchema.test.js
@@ -229,7 +229,7 @@ describe('ObjectSchema', () => {
             .valueOf()
         ).toEqual({
           $id: id,
-          properties: {'prop': {}},
+          properties: { prop: {} },
           type: 'object'
         })
       })
@@ -1034,5 +1034,28 @@ describe('ObjectSchema', () => {
         customKeyword: true
       })
     })
+
+    it('Carry raw properties', () => {
+      const schema = S.object()
+        .prop('test', S.ref('foo').raw({ test: true }))
+        .valueOf()
+      expect(schema).toEqual({
+        $schema: 'http://json-schema.org/draft-07/schema#',
+        type: 'object',
+        properties: { test: { $ref: 'foo', test: true } }
+      })
+    })
+
+    it('Carry raw properties multiple props', () => {
+      const schema = S.object()
+        .prop('a', S.string())
+        .prop('test', S.ref('foo').raw({ test: true }))
+        .valueOf()
+      expect(schema).toEqual({
+        $schema: 'http://json-schema.org/draft-07/schema#',
+        type: 'object',
+        properties: { a: { type: 'string' }, test: { $ref: 'foo', test: true } }
+      })
+    })
   })
 })