diff --git a/Source/UI/UIBartermarketWnd.cpp b/Source/UI/UIBartermarketWnd.cpp
index 1bc51bcb..13d8136f 100644
--- a/Source/UI/UIBartermarketWnd.cpp
+++ b/Source/UI/UIBartermarketWnd.cpp
@@ -1979,3 +1979,12 @@ void UIExpandedBarterItemPurchaseWnd::Paint() {
   }
 }
 
+// OFFSET: 0x00840100
+// FUNCTION: fn_10538
+UIBarterItemPurchaseWnd::UIBarterItemPurchaseWnd() : UIItemPurchaseWnd() {
+}
+
+// OFFSET: 0x00840160
+// FUNCTION: fn_10539
+UIBartermarketWnd::UIBartermarketWnd() : UIItemShopWnd() {
+}
diff --git a/Source/UI/UIBartermarketWnd.h b/Source/UI/UIBartermarketWnd.h
index 5f4a5ff7..de425e07 100644
--- a/Source/UI/UIBartermarketWnd.h
+++ b/Source/UI/UIBartermarketWnd.h
@@ -72,6 +72,7 @@ public:
 
 class UIBarterItemPurchaseWnd : public UIItemPurchaseWnd {
 public:
+  UIBarterItemPurchaseWnd();
   void Paint() override;
   void Slot10(int x, int y, std::intptr_t value) override;
   void Slot15(int width, int height) override;
@@ -87,6 +88,7 @@ public:
 
 class UIBartermarketWnd : public UIItemShopWnd {
 public:
+  UIBartermarketWnd();
   void Paint() override;
   void Slot10(int x, int y, std::intptr_t value) override;
   void Slot15(int width, int height) override;