diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index 287d94062..00129d7c5 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp
@@ -9144,7 +9144,7 @@ int ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_get
             const float v1 = values_getter(data, (v1_idx + values_offset + 1) % values_count);
             const ImVec2 tp1 = ImVec2( t1, 1.0f - ImSaturate((v1 - scale_min) * inv_scale) );
 
-            // NB: Draw calls are merged together by the DrawList system. Still, we should render our batch are lower level to save a bit of CPU.
+            // We could render lower-level to save a bit of CPU.
             ImVec2 pos0 = ImLerp(inner_bb.Min, inner_bb.Max, tp0);
             ImVec2 pos1 = ImLerp(inner_bb.Min, inner_bb.Max, (plot_type == ImGuiPlotType_Lines) ? tp1 : ImVec2(tp1.x, histogram_zero_line_t));
             if (plot_type == ImGuiPlotType_Lines)
@@ -9155,6 +9155,8 @@ int ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_get
             {
                 if (pos1.x >= pos0.x + 2.0f)
                     pos1.x -= 1.0f;
+                if (pos0.y > pos1.y)
+                    ImSwap(pos0.y, pos1.y);
                 window->DrawList->AddRectFilled(pos0, pos1, idx_hovered == v1_idx ? col_hovered : col_base);
             }