diff --git a/dev-install.sh b/dev-install.sh
index 24cdb3ad63..c79fb448a1 100755
--- a/dev-install.sh
+++ b/dev-install.sh
@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
-
 # For a clean conda environment please read docs/source/dev_install.md
 
+set -x
+
 echo -n "Checking pip... "
 pip --version
 if [ $? -ne 0 ]; then
@@ -38,7 +39,7 @@ else
     jupyter nbclassic-extension install --overwrite --py --symlink $nbExtFlags widgetsnbextension || true
 fi
 jupyter nbextension enable --py $nbExtFlags widgetsnbextension || true
-jupyter nbclassic-nbextension enable --py $nbExtFlags widgetsnbextension || true
+jupyter nbclassic-extension enable --py $nbExtFlags widgetsnbextension || true
 
 echo -n "ipywidgets"
 pip install -v -e "./python/ipywidgets[test]"