diff --git a/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs b/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs
index 18283432e4..2866c59cf3 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs
@@ -399,6 +399,8 @@ namespace Avalonia.Win32
                     {
                         MINMAXINFO mmi = Marshal.PtrToStructure<MINMAXINFO>(lParam);
 
+                        _maxTrackSize = mmi.ptMaxTrackSize;
+
                         if (_minSize.Width > 0)
                         {
                             mmi.ptMinTrackSize.X =