diff --git a/include/battle.h b/include/battle.h
index 71dbb19491..6c528866cf 100755
--- a/include/battle.h
+++ b/include/battle.h
@@ -1210,7 +1210,7 @@ static inline struct PartyState *GetBattlerPartyState(u32 battler)
 
 static inline bool32 IsDoubleBattle(void)
 {
-    return (gBattleTypeFlags & BATTLE_TYPE_MORE_THAN_TWO_BATTLERS);
+    return !!(gBattleTypeFlags & BATTLE_TYPE_MORE_THAN_TWO_BATTLERS);
 }
 
 static inline bool32 IsSpreadMove(u32 moveTarget)