diff --git a/win/win32/mhmain.c b/win/win32/mhmain.c
index 959917cc6..46a71b7d4 100644
--- a/win/win32/mhmain.c
+++ b/win/win32/mhmain.c
@@ -25,6 +25,7 @@ extern winid WIN_STATUS;
 
 static TCHAR szMainWindowClass[] = TEXT("MSNHMainWndClass");
 static TCHAR szTitle[MAX_LOADSTRING];
+struct window_tracking_data windowdata[MAXWINDOWS];
 extern void mswin_display_splash_window(BOOL);
 
 LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM);
diff --git a/win/win32/winMS.h b/win/win32/winMS.h
index 6b0170e91..1cb26aed2 100644
--- a/win/win32/winMS.h
+++ b/win/win32/winMS.h
@@ -46,7 +46,7 @@
 struct window_tracking_data {
     genericptr_t address;
     int isstatic;
-} windowdata[MAXWINDOWS];
+};
 
 /* these are only in MSWIN_GRAPHICS, not the core */
 enum mswin_window_types {
@@ -55,6 +55,7 @@ enum mswin_window_types {
     NHW_RIP,
     NHW_SPLASH
 };
+extern struct window_tracking_data windowdata[MAXWINDOWS];
 
 #ifndef TILE_X
 #define TILE_X 16