diff --git a/Source/Client/Mode/CGameMode.h b/Source/Client/Mode/CGameMode.h
index 195351859..162664677 100644
--- a/Source/Client/Mode/CGameMode.h
+++ b/Source/Client/Mode/CGameMode.h
@@ -822,6 +822,7 @@ public:
   void ReceiveVendingItemList(int aid, int storeId, char own, int count, std::uint32_t duration, const unsigned char* data, int value, int unused);
   void ReceiveVendingItemList2(int aid, int storeId, char own, int count, std::uint32_t duration, const unsigned char* data);
   void ReceiveVendingItemSoldNow(const unsigned char* data);
+  void ProcessBuyingStorePurchase(int updateTime, int itemId, int amount, int zeny, int zenyLimit, int charId);
   void ReceiveBuyingStorePurchase(const unsigned char* packet);
   void ReceiveFriendAddResult(const unsigned char* data);
   void ReceiveNavigation(const unsigned char* packet);
@@ -1036,6 +1037,5 @@ int CountItemRandomOptions(const unsigned char* entries);
 void TraceSelection(int selection);
 void TraceSelectionRange(int first, int last);
 void WriteMyLog(const char* file, int line, const char* format, ...);
-void __stdcall ProcessBuyingStorePurchase(int updateTime, int itemId, int amount, int zeny, int zenyLimit, int charId);
 
 #endif
diff --git a/Source/Client/Mode/GameModeNotices.cpp b/Source/Client/Mode/GameModeNotices.cpp
index 8e60c1741..cae580aae 100644
--- a/Source/Client/Mode/GameModeNotices.cpp
+++ b/Source/Client/Mode/GameModeNotices.cpp
@@ -3950,7 +3950,7 @@ static __forceinline void FillVendingItem(ITEM_INFO& item, const VendingItemReco
 // OFFSET: 0x00D47720
 // FUNCTION: fn_21850
 void CGameMode::ReceiveVendingItemSoldNow(const unsigned char* data) {
-  ProcessBuyingStorePurchase(static_cast<int>(_time32(nullptr)), *reinterpret_cast<const int*>(data + 2),
+  this->ProcessBuyingStorePurchase(static_cast<int>(_time32(nullptr)), *reinterpret_cast<const int*>(data + 2),
              *reinterpret_cast<const short*>(data + 6), *reinterpret_cast<const int*>(data + 8), 0, 0);
 }
 
diff --git a/Source/Client/Mode/GameModePackets.cpp b/Source/Client/Mode/GameModePackets.cpp
index 8d063ef79..52a2c91ef 100644
--- a/Source/Client/Mode/GameModePackets.cpp
+++ b/Source/Client/Mode/GameModePackets.cpp
@@ -1977,7 +1977,7 @@ void __stdcall ProcessVendingSale(int field8, int itemIdWord, int quantityWord,
 
 // OFFSET: 0x00D08670
 // FUNCTION: fn_21592
-void __declspec(noinline) __stdcall ProcessBuyingStorePurchase(int updateTime, int itemId, int amount, int zeny, int zenyLimit, int charId) {
+__declspec(noinline) void CGameMode::ProcessBuyingStorePurchase(int updateTime, int itemId, int amount, int zeny, int zenyLimit, int charId) {
   ITEM_INFO item = g_session.FindItem1758ByItemId(itemId);
   item.SetItemId(itemId);
   item.quantity = amount;
@@ -2003,7 +2003,7 @@ void __declspec(noinline) __stdcall ProcessBuyingStorePurchase(int updateTime, i
 // OFFSET: 0x00D08640
 // FUNCTION: fn_21591
 __declspec(noinline) void CGameMode::ReceiveBuyingStorePurchase(const unsigned char* packet) {
-  ProcessBuyingStorePurchase(
+  this->ProcessBuyingStorePurchase(
     *reinterpret_cast<const int*>(packet + 0x14),
     *reinterpret_cast<const int*>(packet + 2),
     *reinterpret_cast<const short*>(packet + 6),