diff --git a/scripts/ci_script.sh b/scripts/ci_script.sh
index b25dd6ee9b5d..954f59b1f17f 100644
--- a/scripts/ci_script.sh
+++ b/scripts/ci_script.sh
@@ -194,6 +194,7 @@ if [[ $GROUP == usage ]]; then
     jupyter labextension list 1>labextensions 2>&1
     cat labextensions | grep "@jupyterlab/mock-extension.*enabled.*OK"
     jupyter labextension build extension --static-url /foo/
+    jupyter labextension build extension --core-path ./examples/federated/core_package
     jupyter labextension disable @jupyterlab/mock-extension --debug
     jupyter labextension enable @jupyterlab/mock-extension --debug
     jupyter labextension uninstall @jupyterlab/mock-extension --debug