diff --git a/package.json b/package.json
index 0c98cdf9a86943b1567351f3cc3c9c4de5360ed6..72419598b9f11cd00d57875dba5e10c7ab3e17ef 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "test-inspect": "mocha --inspect-brk=0.0.0.0:9229",
     "test-watch": "tsc-watch --sourceMap --onSuccess 'nyc mocha'",
     "ci": "nyc mocha --timeout=10000",
-    "build": "rm -rf lib test public && tsc && webpack --config webpack.prod.js",
+    "build": "rm -rf lib test public && npm install && tsc && webpack --config webpack.prod.js",
     "nyc": "nyc"
   },
   "author": "Ulf Seltmann <ulf.seltmann@uni-leipzig.de>",