diff --git a/src/bin/installDeps.sh b/src/bin/installDeps.sh
index 6ea555db..94d8630c 100755
--- a/src/bin/installDeps.sh
+++ b/src/bin/installDeps.sh
@@ -40,7 +40,7 @@ log "Ensure that all dependencies are up to date...  If this is the first time y
   cd node_modules
   [ -e ep_etherpad-lite ] || ln -s ../src ep_etherpad-lite
   cd ep_etherpad-lite
-  npm ci
+  npm ci --no-optional
 ) || {
   rm -rf src/node_modules
   exit 1