diff --git a/src/battle_util.c b/src/battle_util.c
index 79b786b944..3380420310 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -64,7 +64,7 @@ static bool32 TryRemoveScreens(u32 battler);
 static bool32 IsUnnerveAbilityOnOpposingSide(u32 battler);
 static u32 GetFlingPowerFromItemId(u32 itemId);
 static void SetRandomMultiHitCounter();
-static bool32 IsNonVolatileStatusBlocked(u32 battlerDef, enum Ability abilityDef, enum Ability abilityAffected, const u8 *battleScript, enum FunctionCallOption option);
+static bool32 IsNonVolatileStatusBlocked(u32 battlerDef, enum Ability abilityDef, bool32 abilityAffected, const u8 *battleScript, enum FunctionCallOption option);
 static bool32 CanSleepDueToSleepClause(u32 battlerAtk, u32 battlerDef, enum FunctionCallOption option);
 static bool32 IsOpposingSideEmpty(u32 battler);
 static void ResetParadoxWeatherStat(u32 battler);
@@ -6251,7 +6251,7 @@ bool32 CanSetNonVolatileStatus(u32 battlerAtk, u32 battlerDef, enum Ability abil
     return TRUE;
 }
 
-static bool32 IsNonVolatileStatusBlocked(u32 battlerDef, enum Ability abilityDef, enum Ability abilityAffected, const u8 *battleScript, enum FunctionCallOption option)
+static bool32 IsNonVolatileStatusBlocked(u32 battlerDef, enum Ability abilityDef, bool32 abilityAffected, const u8 *battleScript, enum FunctionCallOption option)
 {
     if (battleScript != NULL)
     {