diff --git a/editor/import/editor_import_collada.cpp b/editor/import/editor_import_collada.cpp
index 863b13cbd7c..89db0191ee2 100644
--- a/editor/import/editor_import_collada.cpp
+++ b/editor/import/editor_import_collada.cpp
@@ -480,7 +480,7 @@ Error ColladaImport::_create_material(const String &p_target) {
 		}
 	}
 
-	float roughness = Math::sqrt(1.0 - ((Math::log(effect.shininess) / Math::log(2.0)) / 8.0)); //not very right..
+	float roughness = - Math::sqrt(1.0 - ((Math::log(effect.shininess) / Math::log(2.0)) / 9.0)) + 1;
 	material->set_roughness(roughness);
 
 	if (effect.double_sided) {