diff --git a/selfdrive/ui/ui.cc b/selfdrive/ui/ui.cc
index 821064f81f..e1ef5192b6 100644
--- a/selfdrive/ui/ui.cc
+++ b/selfdrive/ui/ui.cc
@@ -63,6 +63,8 @@ void update_line_data(const UIState *s, const cereal::ModelDataV2::XYZTData::Rea
   right_points.reserve(max_idx + 1);
 
   for (int i = 0; i <= max_idx; i++) {
+    // highly negative x positions cause flickering, clip to zy plane of camera
+    if (line_x[i] < 0) continue;
     QPointF left, right;
     bool l = calib_frame_to_full_frame(s, line_x[i], line_y[i] - y_off, line_z[i] + z_off, &left);
     bool r = calib_frame_to_full_frame(s, line_x[i], line_y[i] + y_off, line_z[i] + z_off, &right);