diff --git a/io_scene_obj/export_obj.py b/io_scene_obj/export_obj.py
index 9418cc673de5f60fe8356a7ce2c4bdce65c15685..3933abfa26c2fd2c2eb0f2ce1cff50f10fa1b237 100644
--- a/io_scene_obj/export_obj.py
+++ b/io_scene_obj/export_obj.py
@@ -188,7 +188,10 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
                         options.append('-o %.6f %.6f %.6f' % mtex.offset[:])
                     if mtex.scale != Vector((1.0, 1.0, 1.0)):
                         options.append('-s %.6f %.6f %.6f' % mtex.scale[:])
-                    fw('%s %s %s\n' % (key, " ".join(options), repr(filepath)[1:-1]))
+                    if options:
+                        fw('%s %s %s\n' % (key, " ".join(options), repr(filepath)[1:-1]))
+                    else:
+                        fw('%s %s\n' % (key, repr(filepath)[1:-1]))
 
 
 def test_nurbs_compat(ob):