diff --git a/ci/brew-install-node.inc.sh b/ci/brew-install-node.inc.sh
index d3e571ab..19d147bc 100644
--- a/ci/brew-install-node.inc.sh
+++ b/ci/brew-install-node.inc.sh
@@ -49,7 +49,7 @@ unset BREW_FORMULAE
 
 # allow npm upgrade to fail on WSL; fails with EACCESS
 IS_WSL=$([[ -e /proc/version ]] && cat /proc/version | grep -q -e "Microsoft" && echo true || echo false)
-npm install --global npm@6 || ${IS_WSL}
+npm install --global --force npm@6 || ${IS_WSL}
 npm install --global json@9
 
 echo_done