diff --git a/pipeline/02-assess.R b/pipeline/02-assess.R
index 8ce5436ed..74f9b8e42 100644
--- a/pipeline/02-assess.R
+++ b/pipeline/02-assess.R
@@ -91,7 +91,12 @@ assessment_card_data_mc <- assessment_card_data_pred %>%
   # For prorated PINs with multiple cards, take the average of the card
   # (building) across PINs. This is because the same prorated building spread
   # across multiple PINs sometimes receives different values from the model
-  group_by(meta_tieback_key_pin, meta_card_num, char_land_sf) %>%
+  group_by(
+    meta_tieback_key_pin,
+    meta_card_num,
+    char_land_sf,
+    meta_pin_num_cards
+  ) %>%
   mutate(
     pred_card_intermediate_fmv = ifelse(
       is.na(meta_tieback_key_pin),