diff --git a/imgui.cpp b/imgui.cpp
index 3eb51958..168162d1 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -5999,11 +5999,15 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         // Draw navigation selection/windowing rectangle border
         if (g.NavWindowingTarget == window)
         {
+            float rounding = ImMax(window->WindowRounding, g.Style.WindowRounding);
             ImRect bb = window->Rect();
             bb.Expand(g.FontSize);
-            if (bb.Contains(viewport_rect))
-                bb.Expand(-g.FontSize - 2.0f);
-            window->DrawList->AddRect(bb.Min, bb.Max, GetColorU32(ImGuiCol_NavWindowingHighlight, g.NavWindowingHighlightAlpha), g.Style.WindowRounding, ~0, 3.0f);
+            if (bb.Contains(viewport_rect)) // If a window fits the entire viewport, adjust its highlight inward
+            {
+                bb.Expand(-g.FontSize - 1.0f);
+                rounding = window->WindowRounding;
+            }
+            window->DrawList->AddRect(bb.Min, bb.Max, GetColorU32(ImGuiCol_NavWindowingHighlight, g.NavWindowingHighlightAlpha), rounding, ~0, 3.0f);
         }
 
         // Store a backup of SizeFull which we will use next frame to decide if we need scrollbars.