diff --git a/data/battle_ai_scripts.s b/data/battle_ai_scripts.s
index 39e96f5cd2..91c0917771 100644
--- a/data/battle_ai_scripts.s
+++ b/data/battle_ai_scripts.s
@@ -554,6 +554,8 @@ AI_CBM_AttackDown: @ 82DC387
 
 AI_CBM_DefenseDown: @ 82DC39C
 	if_stat_level_equal AI_TARGET, STAT_DEF, 0, Score_Minus10
+	get_ability AI_TARGET
+	if_equal ABILITY_BIG_PECKS, Score_Minus10
 	goto CheckIfAbilityBlocksStatChange
 
 AI_CBM_SpeedDown: @ 82DC3A9
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index eb95ea07e6..6d3f94825d 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -4262,7 +4262,8 @@ static void Cmd_playstatchangeanimation(void)
                         && ability != ABILITY_CLEAR_BODY
                         && ability != ABILITY_WHITE_SMOKE
                         && !(ability == ABILITY_KEEN_EYE && currStat == STAT_ACC)
-                        && !(ability == ABILITY_HYPER_CUTTER && currStat == STAT_ATK))
+                        && !(ability == ABILITY_HYPER_CUTTER && currStat == STAT_ATK)
+                        && !(ability == ABILITY_BIG_PECKS && currStat == STAT_DEF))
                 {
                     if (gBattleMons[gActiveBattler].statStages[currStat] > 0)
                     {