diff --git a/test/test.js b/test/test.js
index d86d396..0e48419 100644
--- a/test/test.js
+++ b/test/test.js
@@ -531,6 +531,20 @@ suite('Unflatten', function () {
       })
     })
   }
+
+  test('should not pollute prototype', function () {
+      unflatten({
+          '__proto__.polluted': true
+      });
+      unflatten({
+          'prefix.__proto__.polluted': true
+      });
+      unflatten({
+          'prefix.0.__proto__.polluted': true
+      });
+
+      assert.notStrictEqual({}.polluted, true);
+  })
 })
 
 suite('Arrays', function () {