diff --git a/tools/populate-docs.sh b/tools/populate-docs.sh
index 8db5dd13..a4473a71 100755
--- a/tools/populate-docs.sh
+++ b/tools/populate-docs.sh
@@ -13,4 +13,4 @@ src/generate-markdown.py --output-directory=docs
 
 mkdocs build
 
-htmlproofer --empty-alt-ignore --file-ignore "./ping-protocol/404.html" --url-ignore "https://fonts.gstatic.com" || exit 1
+htmlproofer --ignore-empty-alt --file-ignore "./ping-protocol/404.html" --ignore-urls "https://fonts.gstatic.com" || exit 1