diff --git a/src/backends/gr.jl b/src/backends/gr.jl
index 9fc65c27..7df19ff0 100644
--- a/src/backends/gr.jl
+++ b/src/backends/gr.jl
@@ -998,7 +998,6 @@ function gr_display(sp::Subplot{GRBackend}, w, h, viewport_canvas)
                 GR.surface(x, y, z, GR.OPTION_CELL_ARRAY)
             else
                 GR.setlinetype(gr_linetype[series[:linestyle]])
-                width, height = gr_plot_size
                 GR.setlinewidth(max(0, series[:linewidth] / (sum(gr_plot_size) * 0.001)))
                 GR.contour(x, y, h, z, 1000)
             end