diff --git a/modules/gfx/src/map_iso.cc b/modules/gfx/src/map_iso.cc
index 2dec10e3bae0bbb9cbdb22d47bbec53b609be37b..9c7f1c878096954621b46e24351a8c2f515d1efa 100644
--- a/modules/gfx/src/map_iso.cc
+++ b/modules/gfx/src/map_iso.cc
@@ -119,6 +119,7 @@ void MapIso::OnRenderModeChange()
     render_mode_=RenderMode::SIMPLE;
     va_.SetLighting(false);
     va_.SetCullFace(false);
+    va_.SetLineWidth(this->GetLineWidth());
     va_.SetMode(0x2); // only lines
     va_.SetTwoSided(true);
   }