diff --git a/07_sizing_and_tta.ipynb b/07_sizing_and_tta.ipynb
index 2307cbe..9db6b84 100644
--- a/07_sizing_and_tta.ipynb
+++ b/07_sizing_and_tta.ipynb
@@ -848,7 +848,7 @@
     "```python\n",
     "model = xresnet50()\n",
     "learn = Learner(dls, model, loss_func=CrossEntropyLossFlat(), \n",
-    "                metrics=accuracy, cbs=MixUp)\n",
+    "                metrics=accuracy, cbs=MixUp())\n",
     "learn.fit_one_cycle(5, 3e-3)\n",
     "```"
    ]
@@ -1023,4 +1023,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}
\ No newline at end of file