diff --git a/test/models/OBJ/empty_mat.mtl b/test/models/OBJ/empty_mat.mtl
index 84db99062..8f52a73b0 100644
--- a/test/models/OBJ/empty_mat.mtl
+++ b/test/models/OBJ/empty_mat.mtl
@@ -4,7 +4,7 @@ newmtl
 Ns 0
 Ka 0.000000 0.000000 0.000000
 Kd 0.8 0.8 0.8
-Ks 0.8 0.8 0.8
+Ks 0
 d 1
 illum 2