diff --git a/src/user/user_init.c b/src/user/user_init.c
index 60f74c64..44b3a4fa 100644
--- a/src/user/user_init.c
+++ b/src/user/user_init.c
@@ -287,7 +287,7 @@ void mjs_defaultMaterial(mjsMaterial* material) {
   material->texrepeat[0] = material->texrepeat[1] = 1;
   material->specular = 0.5;
   material->shininess = 0.5;
-  material->metallic = 1.;
+  material->metallic = 0.0;
   material->roughness = 1.0;
   material->rgba[0] = material->rgba[1] = material->rgba[2] = material->rgba[3] = 1;
 }