diff --git a/test/validators.test.js b/test/validators.test.js
index 98d2a12ff..9b7b6fca7 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -7319,6 +7319,7 @@ describe('Validators', () => {
     test({
       validator: 'isAscii',
       valid: [
+        '\x7F', // DEL is the highest ASCII code point.
         'foobar',
         '0987654321',
         'test@example.com',