diff --git a/package.json b/package.json
index 0056adc..f875f7d 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   },
   "scripts": {
     "start": "node lib/index.js",
-    "test": "mocha"
+    "test": "if [ \"${MEASURE_COVERAGE}\" = 'true' ]; then nyc mocha; else mocha; fi"
   },
   "repository": {
     "type": "git",