diff --git a/src/Player.cc b/src/Player.cc
index 498b7802..30abc7ee 100644
--- a/src/Player.cc
+++ b/src/Player.cc
@@ -58,8 +58,8 @@ void ClientGameData::create_battle_overlay(shared_ptr<const BattleRules> rules,
   if (rules->replace_char) {
     // TODO: Shouldn't we clear other material usage here? It looks like the
     // original code doesn't, but that seems wrong.
-    this->overlay_player_data->inventory.hp_materials_used = 0;
-    this->overlay_player_data->inventory.tp_materials_used = 0;
+    this->overlay_player_data->inventory.hp_from_materials = 0;
+    this->overlay_player_data->inventory.tp_from_materials = 0;
 
     uint32_t target_level = clamp<uint32_t>(rules->char_level, 0, 199);
     uint8_t char_class = this->overlay_player_data->disp.visual.char_class;
@@ -442,9 +442,9 @@ void SavedPlayerDataBB::set_technique_level(uint8_t which, uint8_t level) {
 uint8_t SavedPlayerDataBB::get_material_usage(MaterialType which) const {
   switch (which) {
     case MaterialType::HP:
-      return this->inventory.hp_materials_used;
+      return this->inventory.hp_from_materials >> 1;
     case MaterialType::TP:
-      return this->inventory.tp_materials_used;
+      return this->inventory.tp_from_materials >> 1;
     case MaterialType::POWER:
     case MaterialType::MIND:
     case MaterialType::EVADE:
@@ -459,10 +459,10 @@ uint8_t SavedPlayerDataBB::get_material_usage(MaterialType which) const {
 void SavedPlayerDataBB::set_material_usage(MaterialType which, uint8_t usage) {
   switch (which) {
     case MaterialType::HP:
-      this->inventory.hp_materials_used = usage;
+      this->inventory.hp_from_materials = usage << 1;
       break;
     case MaterialType::TP:
-      this->inventory.tp_materials_used = usage;
+      this->inventory.tp_from_materials = usage << 1;
       break;
     case MaterialType::POWER:
     case MaterialType::MIND:
@@ -477,8 +477,8 @@ void SavedPlayerDataBB::set_material_usage(MaterialType which, uint8_t usage) {
 }
 
 void SavedPlayerDataBB::clear_all_material_usage() {
-  this->inventory.hp_materials_used = 0;
-  this->inventory.tp_materials_used = 0;
+  this->inventory.hp_from_materials = 0;
+  this->inventory.tp_from_materials = 0;
   for (size_t z = 0; z < 5; z++) {
     this->inventory.items[z + 8].extension_data2 = 0;
   }
diff --git a/src/PlayerSubordinates.cc b/src/PlayerSubordinates.cc
index 6475caaa..5cc377b2 100644
--- a/src/PlayerSubordinates.cc
+++ b/src/PlayerSubordinates.cc
@@ -385,12 +385,6 @@ PlayerRecordsBB_Challenge::operator PlayerRecordsV3_Challenge<false>() const {
   return ret;
 }
 
-PlayerInventory::PlayerInventory()
-    : num_items(0),
-      hp_materials_used(0),
-      tp_materials_used(0),
-      language(0) {}
-
 void PlayerBank::add_item(const ItemData& item) {
   uint32_t pid = item.primary_identifier();
 
diff --git a/src/PlayerSubordinates.hh b/src/PlayerSubordinates.hh
index 6769d359..5a6a8468 100644
--- a/src/PlayerSubordinates.hh
+++ b/src/PlayerSubordinates.hh
@@ -64,14 +64,12 @@ struct PlayerBankItem {
 
 struct PlayerInventory {
   /* 0000 */ uint8_t num_items = 0;
-  /* 0001 */ uint8_t hp_materials_used = 0;
-  /* 0002 */ uint8_t tp_materials_used = 0;
-  /* 0003 */ uint8_t language = 1; // English
+  /* 0001 */ uint8_t hp_from_materials = 0;
+  /* 0002 */ uint8_t tp_from_materials = 0;
+  /* 0003 */ uint8_t language = 0;
   /* 0004 */ parray<PlayerInventoryItem, 30> items;
   /* 034C */
 
-  PlayerInventory();
-
   size_t find_item(uint32_t item_id) const;
   size_t find_item_by_primary_identifier(uint32_t primary_identifier) const;