diff --git a/selfdrive/ui/qt/util.cc b/selfdrive/ui/qt/util.cc
index 72bc07f27f..458d0be2fc 100644
--- a/selfdrive/ui/qt/util.cc
+++ b/selfdrive/ui/qt/util.cc
@@ -96,6 +96,7 @@ void setQtSurfaceFormat() {
   fmt.setRenderableType(QSurfaceFormat::OpenGLES);
 #endif
   fmt.setSamples(16);
+  fmt.setStencilBufferSize(1);
   QSurfaceFormat::setDefaultFormat(fmt);
 }
 
diff --git a/selfdrive/ui/ui.cc b/selfdrive/ui/ui.cc
index 6314ef6ba0..c4586c1ff5 100644
--- a/selfdrive/ui/ui.cc
+++ b/selfdrive/ui/ui.cc
@@ -96,7 +96,7 @@ void update_model(UIState *s,
   int max_idx = get_path_length_idx(lane_lines[0], max_distance);
   for (int i = 0; i < std::size(scene.lane_line_vertices); i++) {
     scene.lane_line_probs[i] = lane_line_probs[i];
-    update_line_data(s, lane_lines[i], 0.025, 0, &scene.lane_line_vertices[i], max_idx);
+    update_line_data(s, lane_lines[i], 0.025 * scene.lane_line_probs[i], 0, &scene.lane_line_vertices[i], max_idx);
   }
 
   // update road edges