diff --git a/examples/evaluation_examples/demo.ipynb b/examples/evaluation_examples/demo.ipynb
index a07d2d5..48caf98 100644
--- a/examples/evaluation_examples/demo.ipynb
+++ b/examples/evaluation_examples/demo.ipynb
@@ -142,7 +142,7 @@
    "outputs": [],
    "source": [
     "truth = DS.add_data('truth', ztrue_data()['photometry'], TableHandle)\n",
-    "ensemble = DS.add_data('ensemble', fzdata, QPHandle)"
+    "ensemble = DS.add_data('ensemble', fzdata(), QPHandle)"
    ]
   },
   {