diff --git a/Source/UI/Window/UIWindowMgr.h b/Source/UI/Window/UIWindowMgr.h
index 5ca62b3c..30e59997 100644
--- a/Source/UI/Window/UIWindowMgr.h
+++ b/Source/UI/Window/UIWindowMgr.h
@@ -16,6 +16,7 @@
 #include <vector>
 
 class UIWindow;
+class UIMessageBox;
 class CBitmapRes;
 class CWebBrowser;
 struct MessengerMember;
@@ -373,7 +374,7 @@ public:
   /* 09CC */ CWebBrowser* activeBrowser;
   /* 09D0 */ CWebBrowser* specialBrowser;
   /* 09D4 */ unsigned char unknown_09D4[0x10];
-  /* 09E4 */ std::vector<UIWindow*> messageBoxes;
+  /* 09E4 */ std::vector<UIMessageBox*> messageBoxes;
   /* 09F0 */ unsigned char unknown_09F0[0x40];
   /* 0A30 */ UIWindow* window_0A30;
   /* 0A34 */ WindowPolicyEntry policy[10041];
diff --git a/Source/UI/Window/WindowDialogs.cpp b/Source/UI/Window/WindowDialogs.cpp
index de395907..3b64c4fc 100644
--- a/Source/UI/Window/WindowDialogs.cpp
+++ b/Source/UI/Window/WindowDialogs.cpp
@@ -248,9 +248,7 @@ int UIWindowMgr::Confirm(
 void UIWindowMgr::AddMessageBox(
   const char* text, int type, bool defaultAccept, int, int timeout, const char* caption, int width, int height, const char* icon, bool track
 ) {
-  std::vector<UIWindow*>& boxes = this->messageBoxes;
-
-  if (boxes.size() > 5) {
+  if (this->messageBoxes.size() > 5) {
     MessageBoxA(hWnd, "Max MessageBox Count", "ERROR", 0);
     return;
   }
@@ -260,7 +258,7 @@ void UIWindowMgr::AddMessageBox(
   this->rendered.push_back(box);
 
   if (track) {
-    boxes.push_back(box);
+    this->messageBoxes.push_back(box);
   }
 
   this->inputWindow = nullptr;