diff --git a/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py b/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py
index fe8a18a48f..2eafa95b37 100644
--- a/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py
+++ b/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py
@@ -122,7 +122,7 @@ class BaseDocumentationSpider(scrapy.Spider):
 
         if getattr(self, 'validate_html', False):
             yield Request(
-                'http://localhost:9988/?out=json',
+                'http://127.0.0.1:9988/?out=json',
                 method='POST',
                 headers={'Content-Type': response.headers['Content-Type']},
                 body=response.body,
diff --git a/tools/test-help-documentation b/tools/test-help-documentation
index 5227ec0049..7977c2b1c4 100755
--- a/tools/test-help-documentation
+++ b/tools/test-help-documentation
@@ -44,6 +44,7 @@ def vnu_servlet() -> Iterator[None]:
             os.path.dirname(__file__),
             '../node_modules/vnu-jar/build/dist/vnu.jar',
         ),
+        '-Dnu.validator.servlet.bind-address=127.0.0.1',
         'nu.validator.servlet.Main',
         '9988',
     ]) as proc: