diff --git a/include/battle_util.h b/include/battle_util.h
index 86fe789f08..d0a9d8f87f 100644
--- a/include/battle_util.h
+++ b/include/battle_util.h
@@ -168,7 +168,7 @@ bool32 IsEntrainmentBannedAbilityAttacker(u16 ability);
 bool32 IsEntrainmentTargetOrSimpleBeamBannedAbility(u16 ability);
 
 bool32 CanSleep(u8 battlerId);
-bool32 CanBePoisoned(u8 gBattlerAttacker, u8 battlerTarget);
+bool32 CanBePoisoned(u8 battlerAttacker, u8 battlerTarget);
 bool32 CanBeBurned(u8 battlerId);
 bool32 CanBeParalyzed(u8 battlerId);
 bool32 CanBeFrozen(u8 battlerId);