diff --git a/vizro-core/examples/_dev/app.py b/vizro-core/examples/_dev/app.py
index 633e515d8..5a71dcd9a 100644
--- a/vizro-core/examples/_dev/app.py
+++ b/vizro-core/examples/_dev/app.py
@@ -12,7 +12,7 @@
 gapminder_neg = px.data.gapminder()
 gapminder_mixed = px.data.gapminder()
 gapminder_neg["lifeExp"] = gapminder_neg["lifeExp"] * (-1)
-gapminder_mixed["lifeExp"].iloc[:200] = gapminder_mixed["lifeExp"].iloc[:200] * (-1)
+gapminder_mixed.loc[:200, "lifeExp"] = gapminder_mixed.loc[:200, "lifeExp"] * (-1)
 
 
 @capture("graph")