diff --git a/contrib/mkdocs/install_mkdocs.sh b/contrib/mkdocs/install_mkdocs.sh
index 1a1127b351..807a5c6b40 100755
--- a/contrib/mkdocs/install_mkdocs.sh
+++ b/contrib/mkdocs/install_mkdocs.sh
@@ -27,4 +27,4 @@ python3 -m pip install install mkdocs-print-site-plugin --quiet $USEROPT
 python3 -m pip install  mkdocs-bibtex --use-pep517 --quiet $USEROPT
 python3 -m pip install  pandoc --use-pep517 --quiet $USEROPT
 python3 -m pip install  pypandoc_binary --use-pep517 --quiet $USEROPT
-python3 -m pip install install git+https://github.com/flywire/caption $USEROPT
+python3 -m pip install install git+https://github.com/flywire/caption --use-pep517 $USEROPT