diff --git a/window-copy.c b/window-copy.c
index a8b7d254..3ba650e2 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -1629,7 +1629,7 @@ window_copy_cursor_up(struct window_pane *wp, int scroll_only)
 
 	oy = screen_hsize(data->backing) + data->cy - data->oy;
 	ox = window_copy_find_length(wp, oy);
-	if (ox != 0) {
+	if (data->cx != ox) {
 		data->lastcx = data->cx;
 		data->lastsx = ox;
 	}
@@ -1671,7 +1671,7 @@ window_copy_cursor_down(struct window_pane *wp, int scroll_only)
 
 	oy = screen_hsize(data->backing) + data->cy - data->oy;
 	ox = window_copy_find_length(wp, oy);
-	if (ox != 0) {
+	if (data->cx != ox) {
 		data->lastcx = data->cx;
 		data->lastsx = ox;
 	}