diff --git a/01_Getting_&_Knowing_Your_Data/Chipotle/Exercise_with_Solutions.ipynb b/01_Getting_&_Knowing_Your_Data/Chipotle/Exercise_with_Solutions.ipynb
index 32d1e7df8..162700786 100644
--- a/01_Getting_&_Knowing_Your_Data/Chipotle/Exercise_with_Solutions.ipynb
+++ b/01_Getting_&_Knowing_Your_Data/Chipotle/Exercise_with_Solutions.ipynb
@@ -761,7 +761,7 @@
    "source": [
     "# Solution 2\n",
     "\n",
-    "chipo.groupby(by=['order_id']).sum().mean()['revenue']"
+    "chipo.groupby('order_id')['revenue'].sum().mean()"
    ]
   },
   {