diff --git a/src/Battling/Models/BattleSide.hpp b/src/Battling/Models/BattleSide.hpp
index 70ae9cf..24420eb 100644
--- a/src/Battling/Models/BattleSide.hpp
+++ b/src/Battling/Models/BattleSide.hpp
@@ -10,7 +10,7 @@ namespace CreatureLib::Battling {
         u8 _creaturesPerSide;
         ArbUt::List<ArbUt::OptionalBorrowedPtr<Creature>> _creatures;
         ArbUt::List<std::shared_ptr<BaseTurnChoice>> _choices;
-        ArbUt::List<bool> _fillableSlots;
+        std::vector<bool> _fillableSlots;
         u8 _choicesSet = 0;
         ScriptSet _volatile;
         ArbUt::BorrowedPtr<Battle> _battle;
@@ -23,7 +23,7 @@ namespace CreatureLib::Battling {
             for (size_t i = 0; i < creaturesPerSide; i++) {
                 _creatures.Append(nullptr);
                 _choices.Append(nullptr);
-                _fillableSlots.Append(true);
+                _fillableSlots[i] = true;
             }
             ResetChoices();
         }
@@ -72,7 +72,7 @@ namespace CreatureLib::Battling {
                 if (!_creatures[i].HasValue())
                     continue;
                 if (_creatures[i].GetValue() == creature) {
-                    _fillableSlots.At(i) = false;
+                    _fillableSlots.at(i) = false;
                     return;
                 }
             }
@@ -83,7 +83,7 @@ namespace CreatureLib::Battling {
                 if (!_creatures[i].HasValue())
                     continue;
                 if (_creatures[i].GetValue() == creature) {
-                    return _fillableSlots.At(i);
+                    return _fillableSlots.at(i);
                 }
             }
             return false;