diff --git a/integration/basic.test.js b/integration/basic.test.js
index 11b01de..c73e111 100644
--- a/integration/basic.test.js
+++ b/integration/basic.test.js
@@ -13,6 +13,22 @@ const browser = puppeteer.launch({ headless: false });
 
 const rootUrl = "http://localhost:3000/public/index.html";
 
+// Returns a promise that rejects and fails the test when the page produces an
+// error message on the console, and never resolves (so don't await it but
+// combine it using Promise.race() - if you don't, the test will still fail, but
+// you'll get an UnhandledPromiseRejectionWarning from node).
+function failOnErrorMessage(page) {
+    return new Promise((resolve, reject) => {
+        page.on('console', msg => {
+            if ((msg.type() === "error" && !msg.location().url.includes('favicon.ico')) || msg.text().startsWith('oops')) {
+                Promise.all(msg.args().map(h => h.evaluate(a => a.toString())))
+                    .then(args => expect({"console message": args}).toBeUndefined())
+                    .catch(e => reject(e));
+            }
+        });
+    });
+}
+
 beforeAll( async () => { await server }, 50000 );
 afterAll( async () => { 
     ( await server ).close();
@@ -103,3 +119,23 @@ test('pretty big schema', async () => {
 
     expect(results).toContain( 'All documents and attachments related to the contract, including any notices.' );
 });
+
+test('additionalProperties', async () => {
+    const page = await ( await browser ).newPage();
+    let errorOccurred = failOnErrorMessage(page);
+
+    await page.goto( rootUrl + "#/integration/schemas/additionalProperties.json");
+    
+    async function textAtPath(path) {
+        let element = await page.waitFor(path);
+        return await element.evaluate(e => e.textContent.trim());
+    }
+    await Promise.race([
+        Promise.all([
+            expect(textAtPath('#doc .box .signature:nth-child(2) .property-name')).resolves.toBe('foo'),
+            expect(textAtPath('#doc .box .signature:nth-child(3) .property-name')).resolves.toBe('bar'),
+            expect(textAtPath('#doc .box .signature:nth-child(4) .box .signature-type')).resolves.toBe('boolean')
+        ]),
+        errorOccurred
+    ]);
+});
diff --git a/integration/schemas/additionalProperties.json b/integration/schemas/additionalProperties.json
new file mode 100644
index 0000000..c8527b1
--- /dev/null
+++ b/integration/schemas/additionalProperties.json
@@ -0,0 +1,4 @@
+{
+    "properties": {"foo": {}, "bar": {}},
+    "additionalProperties": {"type": "boolean"}
+}
diff --git a/public/templates/box.html b/public/templates/box.html
index c39369d..e560a9e 100644
--- a/public/templates/box.html
+++ b/public/templates/box.html
@@ -142,7 +142,7 @@
             <div class="signature-header">
                 <div class="property-name type-pattern">additional</div>
                 <div class="signature-type">
-                    {{schema ../additionalProperties}}
+                    {{schema additionalProperties}}
                 </div>
             </div>
         </div>