diff --git a/Source/Engine/Platform/Windows/WindowsWindow.cpp b/Source/Engine/Platform/Windows/WindowsWindow.cpp
index fcfdbeb23..42f15c7e2 100644
--- a/Source/Engine/Platform/Windows/WindowsWindow.cpp
+++ b/Source/Engine/Platform/Windows/WindowsWindow.cpp
@@ -1251,7 +1251,7 @@ LRESULT WindowsWindow::WndProc(UINT msg, WPARAM wParam, LPARAM lParam)
         OnLostFocus();
         UpdateCursor();
         break;
-    case WM_ACTIVATEAPP:
+    case WM_ACTIVATE:
         if (wParam == TRUE && !_focused)
         {
             OnGotFocus();