diff --git a/R/calculate_stats.R b/R/calculate_stats.R
index 4cfe184c..f8f2e569 100644
--- a/R/calculate_stats.R
+++ b/R/calculate_stats.R
@@ -126,8 +126,8 @@ calculate_stats <- function(seasons = nflreadr::most_recent_season(),
       def_tackles_for_loss = sum(stat_id == 402),
       def_tackles_for_loss_yards = sum((stat_id == 402) * yards),
       def_fumbles_forced = sum(stat_id == 91),
-      def_sacks = sum(stat_id == 83),
-      def_sack_yards = sum((stat_id == 83) * yards),
+      def_sacks = sum(stat_id == 83) + 1 / 2 * sum(stat_id == 84),
+      def_sack_yards = sum((stat_id == 83) * -yards) + 1 / 2 * sum((stat_id == 84) * -yards),
       def_qb_hits = sum(stat_id == 110),
       def_interceptions = sum(stat_id %in% 25:26),
       def_interception_yards = sum((stat_id %in% 25:28) * yards),