diff --git a/gtk2_ardour/grid_lines.cc b/gtk2_ardour/grid_lines.cc
index 6fed78ccb0..1389590a08 100644
--- a/gtk2_ardour/grid_lines.cc
+++ b/gtk2_ardour/grid_lines.cc
@@ -66,11 +66,11 @@ GridLines::draw (std::vector<Ruler::Mark> const & marks)
 		samplepos_t s = m.position;
 
 		if (m.style == ArdourCanvas::Ruler::Mark::Major) {
-			lines.add_coord (PublicEditor::instance().sample_to_pixel_unrounded (s), 1.0, major_color);
+			lines.add_coord (PublicEditor::instance().sample_to_pixel (s), 1.0, major_color);
 		} else if (m.style == ArdourCanvas::Ruler::Mark::Minor) {
-			lines.add_coord (PublicEditor::instance().sample_to_pixel_unrounded (s), 1.0, minor_color);
+			lines.add_coord (PublicEditor::instance().sample_to_pixel (s), 1.0, minor_color);
 		} else {
-			lines.add_coord (PublicEditor::instance().sample_to_pixel_unrounded (s), 1.0, micro_color);
+			lines.add_coord (PublicEditor::instance().sample_to_pixel (s), 1.0, micro_color);
 		}
 	}
 }
diff --git a/gtk2_ardour/midi_region_view.cc b/gtk2_ardour/midi_region_view.cc
index fa0e0f75ac..c933902ec2 100644
--- a/gtk2_ardour/midi_region_view.cc
+++ b/gtk2_ardour/midi_region_view.cc
@@ -2505,8 +2505,8 @@ MidiRegionView::update_drag_selection(timepos_t const & start, timepos_t const &
 
 	// Convert to local coordinates
 	const double     y  = midi_view()->y_position();
-	const double     x0 = editor.sample_to_pixel (max<samplepos_t>(0, _region->region_relative_position (start).samples()));
-	const double     x1 = editor.sample_to_pixel (max<samplepos_t>(0, _region->region_relative_position (end).samples()));
+	const double     x0 = editor.sample_to_pixel_unrounded (max<samplepos_t>(0, _region->region_relative_position (start).samples()));
+	const double     x1 = editor.sample_to_pixel_unrounded (max<samplepos_t>(0, _region->region_relative_position (end).samples()));
 	const double     y0 = max(0.0, gy0 - y);
 	const double     y1 = max(0.0, gy1 - y);