diff --git a/package.json b/package.json
index da3ee6d0..41df83d4 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "test-declaration": "cd example/typescript && tsc && node type-check.js",
     "test-extra": "node test/markdownlint-test-extra.js",
     "lint": "eslint --max-warnings 0 .",
-    "ci": "npm run test-cover && npm run lint && npm run test-declaration",
+    "ci": "npm run test-cover && npm run lint && npm run test-declaration && npm run build-config-schema && git diff --exit-code",
     "build-config-schema": "node schema/build-config-schema.js",
     "build-declaration": "tsc --allowJs --declaration --emitDeclarationOnly --resolveJsonModule lib/markdownlint.js && rimraf 'lib/{c,md,r}*.d.ts' 'helpers/*.d.ts'",
     "build-demo": "cpy node_modules/markdown-it/dist/markdown-it.min.js demo && cd demo && rimraf markdownlint-browser.* && cpy file-header.js . --rename=markdownlint-browser.js && tsc --allowJs --resolveJsonModule --outDir ../lib-es3 ../lib/markdownlint.js && cpy ../helpers/package.json ../lib-es3/helpers && browserify ../lib-es3/lib/markdownlint.js --standalone markdownlint >> markdownlint-browser.js && browserify ../lib-es3/helpers/helpers.js --standalone helpers >> markdownlint-rule-helpers-browser.js && uglifyjs markdownlint-browser.js markdownlint-rule-helpers-browser.js --compress --mangle --comments --output markdownlint-browser.min.js",