diff --git a/src/backends/gr.jl b/src/backends/gr.jl
index 24ddfd42..c41c38ba 100644
--- a/src/backends/gr.jl
+++ b/src/backends/gr.jl
@@ -338,7 +338,7 @@ end
 function gr_set_line(lw, style, c) #, a)
     GR.setlinetype(gr_linetype[style])
     w, h = gr_plot_size
-    GR.setlinewidth(max(1, lw / ((w + h) * 0.001)))
+    GR.setlinewidth(max(0, lw / ((w + h) * 0.001)))
     gr_set_linecolor(c) #, a)
 end