diff --git a/package.json b/package.json
index 979b8aa..6d3c7ab 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "fs": "0.0.2",
     "ini": "~1.3.4",
     "iniparser": "~1.0.5",
+    "lru-cache": "^4.0.1",
     "mathjs": "~1.7.0",
     "minimist": "~1.2.0",
     "mocha": "~2.2.5",