diff --git a/index.js b/index.js
index efee5081..19756e71 100644
--- a/index.js
+++ b/index.js
@@ -835,7 +835,7 @@ function buildValue (context, location, input) {
 
   let code = ''
 
-  if (type === undefined && (schema.anyOf || schema.oneOf)) {
+  if (schema.anyOf || schema.oneOf) {
     context.validatorSchemasIds.add(location.getSchemaId())
 
     const type = schema.anyOf ? 'anyOf' : 'oneOf'
diff --git a/test/issue-290.test.js b/test/issue-290.test.js
new file mode 100644
index 00000000..a7fd1c01
--- /dev/null
+++ b/test/issue-290.test.js
@@ -0,0 +1,75 @@
+'use strict'
+
+const { test } = require('tap')
+const build = require('..')
+
+test('should work with anyOf', (t) => {
+  t.plan(2)
+
+  const schemaFoo = {
+    properties: {
+      foo: { type: 'string' },
+      baz: { type: 'string' }
+    },
+    required: ['foo', 'baz']
+  }
+
+  const schemaBar = {
+    properties: {
+      bar: { type: 'string' },
+      baz: { type: 'string' }
+    },
+    required: ['bar', 'baz']
+  }
+
+  const stringify = build({
+    type: 'object',
+    anyOf: [schemaFoo, schemaBar]
+  })
+
+  t.equal(stringify({ foo: 'foo', baz: 'baz' }), '{"foo":"foo","baz":"baz"}')
+  t.equal(stringify({ bar: 'bar', baz: 'baz' }), '{"bar":"bar","baz":"baz"}')
+})
+
+test('should work with oneOf', (t) => {
+  t.plan(2)
+
+  const schemaFoo = {
+    properties: {
+      foo: { type: 'string' },
+      baz: { type: 'string' }
+    },
+    required: ['foo', 'baz']
+  }
+
+  const schemaBar = {
+    properties: {
+      bar: { type: 'string' },
+      baz: { type: 'string' }
+    },
+    required: ['bar', 'baz']
+  }
+
+  const stringify = build({
+    type: 'object',
+    oneOf: [schemaFoo, schemaBar]
+  })
+
+  t.equal(stringify({ foo: 'foo', baz: 'baz' }), '{"foo":"foo","baz":"baz"}')
+  t.equal(stringify({ bar: 'bar', baz: 'baz' }), '{"bar":"bar","baz":"baz"}')
+})
+
+test('should merge schemas properly', (t) => {
+  t.plan(1)
+
+  const schema = {
+    properties: {
+      foo: { type: 'string' }
+    },
+    oneOf: [{ type: 'object' }]
+  }
+
+  const stringify = build(schema)
+
+  t.equal(stringify({ foo: 'foo' }), '{"foo":"foo"}')
+})