diff --git a/hb-view-ot-svg-skia-GL.py b/hb-view-ot-svg-skia-GL.py
index 6e8290a..3ace7c2 100755
--- a/hb-view-ot-svg-skia-GL.py
+++ b/hb-view-ot-svg-skia-GL.py
@@ -250,7 +250,7 @@ def __init__(self, top, right, bottom, left):
                 y -= sc(pos.y_advance - extent.y_bearing - pos.y_offset)
         surface.flushAndSubmit()
         image = surface.makeImageSnapshot()
-        #image.save("hb-view-ot-svg-skia-GL.png", skia.kPNG) # why does it shows RuntimeError?
+        image.save("hb-view-ot-svg-skia-GL.png", skia.kPNG)
     glfw.swap_buffers(window)
     while (glfw.get_key(window, glfw.KEY_ESCAPE) != glfw.PRESS
            and not glfw.window_should_close(window)):