diff --git a/data/battle_ai_scripts.s b/data/battle_ai_scripts.s
index 1e8ddea42..c8c9d62d9 100644
--- a/data/battle_ai_scripts.s
+++ b/data/battle_ai_scripts.s
@@ -67,6 +67,7 @@ AI_CBM_CheckIfNegatesType:
 	if_equal ABILITY_LIGHTNING_ROD, CheckIfVoltAbsorbCancelsElectric
 	if_equal ABILITY_MOTOR_DRIVE, CheckIfVoltAbsorbCancelsElectric
 	if_equal ABILITY_WATER_ABSORB, CheckIfWaterAbsorbCancelsWater
+	if_equal ABILITY_STORM_DRAIN, CheckIfWaterAbsorbCancelsWater
 	if_equal ABILITY_DRY_SKIN, CheckIfWaterAbsorbCancelsWater
 	if_equal ABILITY_FLASH_FIRE, CheckIfFlashFireCancelsFire
 	if_equal ABILITY_WONDER_GUARD, CheckIfWonderGuardCancelsMove