diff --git a/imgui.cpp b/imgui.cpp
index c4664fa80..a4af7c96c 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -14111,7 +14111,7 @@ static void WindowSettingsHandler_WriteAll(ImGuiContext* ctx, ImGuiSettingsHandl
         settings->ClassId = window->WindowClass.ClassId;
         settings->DockOrder = window->DockOrder;
         settings->Collapsed = window->Collapsed;
-        settings->IsChild = (window->Flags & ImGuiWindowFlags_ChildWindow) != 0;
+        settings->IsChild = (window->RootWindow != window); // Cannot rely on ImGuiWindowFlags_ChildWindow here as docked windows have this set.
         settings->WantDelete = false;
     }