diff --git a/specs/lib/generateModelMaterialsCommonSpec.js b/specs/lib/generateModelMaterialsCommonSpec.js
index d7304e83..979934fe 100644
--- a/specs/lib/generateModelMaterialsCommonSpec.js
+++ b/specs/lib/generateModelMaterialsCommonSpec.js
@@ -163,7 +163,8 @@ describe('generateModelMaterialsCommon', function () {
             ],
             skins: [
                 {
-                    inverseBindMatrices: 0
+                    inverseBindMatrices: 0,
+                    joints: [1, 2, 3, 4]
                 }
             ],
             techniques: [