diff --git a/package.json b/package.json
index da62d76e9f..af0366fb05 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "build:backend": "copyfiles -u 1 src/mailtemplates/**/*.mustache dist/ && tsc --pretty --strictNullChecks false",
     "build:frontend": "yarn --cwd ./frontend run build",
     "build": "yarn run build:frontend && yarn run build:backend",
-    "postinstall": "if [ ! -d \"./dist\" ]; then yarn build; fi",
+    "postinstall": "if [ ! -d \"./dist\" ]; then yarn --cwd ./frontend install && yarn build; fi",
     "dev:backend": "TZ=UTC NODE_ENV=development tsc-watch --strictNullChecks false --onSuccess \"node dist/server-dev.js\"",
     "dev:frontend": "wait-on tcp:4242 && yarn --cwd ./frontend run dev",
     "dev": "concurrently \"yarn:dev:backend\" \"yarn:dev:frontend\"",