diff --git a/imgui.cpp b/imgui.cpp
index 14a33004..26b39a98 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -13724,8 +13724,7 @@ void ImGui::BeginDocked(ImGuiWindow* window, bool* p_open)
         // Calling SetNextWindowPos() undock windows by default (by setting PosUndock)
         bool want_undock = false;
         want_undock |= (window->Flags & ImGuiWindowFlags_NoDocking) != 0;
-        want_undock |= (g.NextWindowData.PosCond && (window->SetWindowPosAllowFlags & g.NextWindowData.PosCond) && g.NextWindowData.PosUndock);
-        g.NextWindowData.PosUndock = false;
+        want_undock |= (g.NextWindowData.Flags & ImGuiNextWindowDataFlags_HasPos) && (window->SetWindowPosAllowFlags & g.NextWindowData.PosCond) && g.NextWindowData.PosUndock;
         if (want_undock)
         {
             DockContextProcessUndockWindow(ctx, window);