diff --git a/src/matrix.cpp b/src/matrix.cpp
index 2d66643..5dfe4d3 100644
--- a/src/matrix.cpp
+++ b/src/matrix.cpp
@@ -323,6 +323,7 @@ bool Matrix::on_expose_event(GdkEventExpose *event)
 	Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
 	cr->set_line_width(1.0);
 	cr->set_antialias(Cairo::ANTIALIAS_NONE);
+	cr->translate(0.5, 0.5);
 
 	// Set clipping area
 	cr->rectangle(event->area.x, event->area.y, event->area.width, event->area.height);
@@ -509,7 +510,7 @@ bool Matrix::on_expose_event(GdkEventExpose *event)
 //				} else {
 					SetColour(cr, cfg.TabPortAudio);
 //				}
-				cr->rectangle(x + 1, y + 1, m_separation - 1, m_separation - 1);
+				cr->rectangle(x + 1, y + 1, m_separation - 2, m_separation - 2);
 				cr->fill();
 			}