diff --git a/src/evdev-mt-touchpad-edge-scroll.c b/src/evdev-mt-touchpad-edge-scroll.c
index aa9197f0..bb3890c1 100644
--- a/src/evdev-mt-touchpad-edge-scroll.c
+++ b/src/evdev-mt-touchpad-edge-scroll.c
@@ -285,30 +285,11 @@ int
 tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device)
 {
 	struct tp_touch *t;
-	int width, height;
 	int edge_width, edge_height;
 
-	width = device->abs.dimensions.x;
-	height = device->abs.dimensions.y;
-
-	switch (tp->model) {
-	case MODEL_ALPS:
-		edge_width = width * .15;
-		edge_height = height * .15;
-		break;
-	case MODEL_APPLETOUCH: /* unibody are all clickpads, so N/A */
-		edge_width = width * .085;
-		edge_height = height * .085;
-		break;
-	default:
-		/* For elantech and synaptics, note for lenovo #40 series,
-		 * e.g. the T440s min/max are the absolute edges, not the
-		 * recommended ones as usual with synaptics.
-		 */
-		edge_width = width * .04;
-		edge_height = height * .054;
-		break;
-	}
+	/* 7mm edge size */
+	edge_width = device->abs.absinfo_x->resolution * 7;
+	edge_height = device->abs.absinfo_y->resolution * 7;
 
 	tp->scroll.right_edge = device->abs.absinfo_x->maximum - edge_width;
 	tp->scroll.bottom_edge = device->abs.absinfo_y->maximum - edge_height;