diff --git a/notebooks/julia_async.ipynb b/notebooks/julia_async.ipynb
index d6a579e..f0b269b 100644
--- a/notebooks/julia_async.ipynb
+++ b/notebooks/julia_async.ipynb
@@ -484,7 +484,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "fun = () -> a + b\n",
+    "fun = () -> add(a, b)\n",
     "t = Task(fun)\n",
     "schedule(t)"
    ]