diff --git a/python-pythreejs.spec b/python-pythreejs.spec
index 7b86bc5..c0beb45 100644
--- a/python-pythreejs.spec
+++ b/python-pythreejs.spec
@@ -124,7 +124,7 @@ export JUPYTER_CONFIG_DIR=%{buildroot}%{_jupyter_confdir}
 %{python_expand # check extensions
 export PYTHONPATH=%{buildroot}%{$python_sitelib}
 jupyter-%{$python_bin_suffix} nbclassic-extension list 2>&1 | grep 'threejs.*enabled'
-jupyter-%{$python_bin_suffix} labextensions list 2>&1 | grep 'threejs.*enabled'
+jupyter-%{$python_bin_suffix} labextension list 2>&1 | grep 'threejs.*enabled'
 }
 rm -f %{buildroot}%{_jupyter_confdir}migrated