diff --git a/domain/magicplan/mapper.py b/domain/magicplan/mapper.py
index 604e330a0..2aa03421c 100644
--- a/domain/magicplan/mapper.py
+++ b/domain/magicplan/mapper.py
@@ -100,7 +100,7 @@ def _map_window_ventilation(
         num_openings=_try_get_int_value("Number of Openings (In Same Window)"),
         pct_openable=_try_get_int_value("% of Window Openable"),
         trickle_vent_area_mm2=_try_get_int_value(
-            "Trickle Vent Effective Area (mm2) (No Code Then Width x Height)"
+            "Total Trickle Vent Effective Area (mm2) (No Code Then Width x Height)"
         ),
         num_trickle_vents=_try_get_int_value("No. of Trickle Vents"),
     )