diff --git a/tiny_obj_loader.h b/tiny_obj_loader.h
index c77ffc8..02ef7b0 100644
--- a/tiny_obj_loader.h
+++ b/tiny_obj_loader.h
@@ -802,7 +802,8 @@ void LoadMtl(std::map<std::string, int> &material_map,
     }
 
     // transmittance
-    if (token[0] == 'K' && token[1] == 't' && IS_SPACE((token[2]))) {
+    if ((token[0] == 'K' && token[1] == 't' && IS_SPACE((token[2])))
+        || (token[0] == 'T' && token[1] == 'F' && IS_SPACE((token[2])))) {
       token += 2;
       float r, g, b;
       parseFloat3(r, g, b, token);