diff --git a/lib/one.js b/lib/one.js
index 4a01282..3c1f899 100644
--- a/lib/one.js
+++ b/lib/one.js
@@ -6,9 +6,28 @@ var u = require('unist-builder');
 var has = require('has');
 var all = require('./all');
 
+/* Check if the node should be renderered a text node. */
+function isTextNode(node) {
+  if ('data' in node) {
+    if ('hName' in node.data) {
+      return false;
+    }
+    if ('hProperties' in node.data) {
+      return false;
+    }
+    if ('hChildren' in node.data) {
+      return false;
+    }
+  }
+  if ('value' in node) {
+    return true;
+  }
+  return false;
+}
+
 /* Transform an unknown node. */
 function unknown(h, node) {
-  if ('value' in node) {
+  if (isTextNode(node)) {
     return h.augment(node, u('text', node.value));
   }
 
diff --git a/test/core.js b/test/core.js
index 4c6421e..1f1ac8a 100644
--- a/test/core.js
+++ b/test/core.js
@@ -90,5 +90,23 @@ test('toHAST()', function (t) {
     'should transform unknown nodes to `div`'
   );
 
+  t.deepEqual(
+    to(u('foo', {data: {hName: 'code', hProperties: {className: 'charlie'}, hChildren: [u('text', 'tango')]}}, 'tango')),
+    u('element', {tagName: 'code', properties: {className: 'charlie'}}, [u('text', 'tango')]),
+    'should transform unknown nodes with `data.h*` properties'
+  );
+
+  t.deepEqual(
+    to(u('foo', {data: {hChildren: [u('text', 'tango')]}}, 'tango')),
+    u('element', {tagName: 'div', properties: {}}, [u('text', 'tango')]),
+    'should transform unknown nodes with `data.hChildren` only to `div`'
+  );
+
+  t.deepEqual(
+    to(u('foo', {data: {hProperties: {className: 'charlie'}}}, 'tango')),
+    u('element', {tagName: 'div', properties: {className: 'charlie'}}, []),
+    'should transform unknown nodes with `data.hProperties` only to a `element` node'
+  );
+
   t.end();
 });