diff --git a/experiments/duckdb_census_of_population.ipynb b/experiments/duckdb_census_of_population.ipynb
index cbfdd8a..8e92e14 100644
--- a/experiments/duckdb_census_of_population.ipynb
+++ b/experiments/duckdb_census_of_population.ipynb
@@ -71,7 +71,7 @@
     "SELECT\n",
     "    geo.da_dguid,\n",
     "    cop.count_total_4,\n",
-    "    (cop.count_total_1 / (ST_Area_Spheroid(ST_FlipCoordinates(geo.geom)) / 1000000.0)) AS count_total_4_per_square_km,\n",
+    "    (cop.count_total_4 / (ST_Area_Spheroid(ST_FlipCoordinates(geo.geom)) / 1000000.0)) AS count_total_4_per_square_km,\n",
     "    geo.geom\n",
     "FROM\n",
     "    'https://data.dataforcanada.org/processed/statistics_canada/census_of_population/2021/tabular/da_2021.parquet' AS cop,\n",