diff --git a/package.json b/package.json
index bf30697..feb5028 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,6 @@
     "sinon-chai": "^2.7.0"
   },
   "scripts": {
-    "test": "grunt test"
+    "test": "DEBUG=ylt:imageOptimizer grunt test"
   }
 }