diff --git a/package.json b/package.json
index e2b3a04110..26fbbca6a2 100644
--- a/package.json
+++ b/package.json
@@ -18,11 +18,11 @@
     "start": "npm run serve-examples",
     "serve-examples": "webpack-dev-server --config examples/webpack/config.js --mode development --watch",
     "build-examples": "webpack --config examples/webpack/config.js --mode production",
-    "build-package": "npm run transpile && npm run copy-css && node tasks/prepare-package && cp README.md build/ol",
+    "build-package": "npm run transpile && npm run copy-css && node tasks/prepare-package && shx cp README.md build/ol",
     "build-index": "npm run build-package && node tasks/generate-index",
-    "build-legacy": "rm -rf build && npm run build-index && webpack --config config/webpack-config-legacy-build.js && cleancss --source-map src/ol/ol.css -o build/legacy/ol.css",
-    "copy-css": "cp src/ol/ol.css build/ol/ol.css",
-    "transpile": "rm -rf build/ol && mkdir -p build && buble --input src/ol --output build/ol --no modules --sourcemap",
+    "build-legacy": "shx rm -rf build && npm run build-index && webpack --config config/webpack-config-legacy-build.js && cleancss --source-map src/ol/ol.css -o build/legacy/ol.css",
+    "copy-css": "shx cp src/ol/ol.css build/ol/ol.css",
+    "transpile": "shx rm -rf build/ol && shx mkdir -p build && buble --input src/ol --output build/ol --no modules --sourcemap",
     "typecheck": "tsc --pretty",
     "apidoc": "jsdoc config/jsdoc/api/index.md -c config/jsdoc/api/conf.json -P package.json -d build/apidoc"
   },
@@ -83,6 +83,7 @@
     "puppeteer": "^1.10.0",
     "rollup": "0.67.1",
     "serve-static": "^1.13.2",
+    "shx": "^0.3.2",
     "sinon": "^6.0.0",
     "terser-webpack-plugin": "^1.1.0",
     "typescript": "^3.1.0-dev.20180905",