diff --git a/python/port/mod/matplotlib/pyplot/plot_view.cpp b/python/port/mod/matplotlib/pyplot/plot_view.cpp
index 1c913f0a6..fdb4a9afb 100644
--- a/python/port/mod/matplotlib/pyplot/plot_view.cpp
+++ b/python/port/mod/matplotlib/pyplot/plot_view.cpp
@@ -57,8 +57,10 @@ void PlotView::traceRect(KDContext * ctx, KDRect r, PlotStore::Rect rect) const
   KDRect pixelRect(
     std::round(floatToPixel(Axis::Horizontal, rect.x())),
     std::round(floatToPixel(Axis::Vertical, rect.y())),
-    maxKDCoordinate(std::round(rect.width() / pixelWidth()), 1), // Rectangle should at least be visible
-    std::round(rect.height() / pixelHeight())
+    // Use std::ceil instead of std::round to avoid empty pixel line between bars and horizontal axis line
+    // TODO: change stored rectangles to keep all summits?
+    maxKDCoordinate(std::ceil(rect.width() / pixelWidth()), 1), // Rectangle should at least be visible
+    std::ceil(rect.height() / pixelHeight())
   );
   ctx->fillRect(pixelRect, rect.color());
 }