diff --git a/package.json b/package.json
index e45fa10b..0e25c36c 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "test": "npm run lint && node ./build/run_tests.js",
     "branch-release": "git reset --hard && branch-release",
     "lint": "tslint -e \"lib/**/*{ngfactory|css.shim}.ts\" lib/**/*.ts",
-    "unit": "karma start",
+    "unit": "npm run build:sass && karma start",
     "e2e": "npm run build:prod && npm run e2e-copy && npm run webdriver && protractor",
     "deploy": "node ./build/prepare_deploy.js && deploy-to-gh-pages --update demo",
     "ngc": "ngc -p .",