diff --git a/package.json b/package.json
index 10359f97f..de03049e4 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
         "prepublish": "./build"
     },
     "dependencies": {
-        "formatio": "~1.0"
+        "formatio": "~1.0",
+        "util": "^0.10.3"
     },
     "devDependencies": {
         "buster-core": ">=0.6.4",