diff --git a/package.json b/package.json
index 6fbf8d596441c46c721c67cdbbf3351091fd5b5f..cf3c88783ab2c29c0f2621786cc43b5b90ac6bc4 100644
--- a/package.json
+++ b/package.json
@@ -45,12 +45,12 @@
     }
   },
   "scripts": {
-    "build": "rollup -c",
+    "build": "rollup -c utils/build/rollup.config.js",
     "build-test": "rollup -c test/rollup.unit.config.js",
-    "build-closure": "rollup -c && google-closure-compiler --warning_level=VERBOSE --jscomp_off=globalThis --jscomp_off=checkTypes --externs utils/build/externs.js --language_in=ECMASCRIPT5_STRICT --js build/three.js --js_output_file build/three.min.js",
-    "build-examples": "rollup -c rollup-examples.config.js",
-    "dev": "concurrently --names \"ROLLUP,HTTP\" -c \"bgBlue.bold,bgGreen.bold\" \"rollup -c -w -m inline\" \"http-server -c-1 -p 8080\"",
-    "dev-test": "concurrently --names \"ROLLUP,ROLLUPTEST,HTTP\" -c \"bgBlue.bold,bgRed.bold,bgGreen.bold\" \"rollup -c -w -m inline\" \"rollup -c test/rollup.unit.config.js -w -m inline\" \"http-server -p 8080\"",
+    "build-closure": "rollup -c utils/build/rollup.config.js && google-closure-compiler --warning_level=VERBOSE --jscomp_off=globalThis --jscomp_off=checkTypes --externs utils/build/externs.js --language_in=ECMASCRIPT5_STRICT --js build/three.js --js_output_file build/three.min.js",
+    "build-examples": "rollup -c utils/build/rollup-examples.config.js",
+    "dev": "concurrently --names \"ROLLUP,HTTP\" -c \"bgBlue.bold,bgGreen.bold\" \"rollup -c utils/build/rollup.config.js -w -m inline\" \"http-server -c-1 -p 8080\"",
+    "dev-test": "concurrently --names \"ROLLUP,ROLLUPTEST,HTTP\" -c \"bgBlue.bold,bgRed.bold,bgGreen.bold\" \"rollup -c utils/build/rollup.config.js -w -m inline\" \"rollup -c test/rollup.unit.config.js -w -m inline\" \"http-server -p 8080\"",
     "start": "npm run dev",
     "lint": "eslint src --ext js --ext ts && tsc src/Three.d.ts --noEmit",
     "test": "npm run build-test && qunit -r failonlyreporter test/unit/three.source.unit.js",
diff --git a/rollup-examples.config.js b/utils/build/rollup-examples.config.js
similarity index 100%
rename from rollup-examples.config.js
rename to utils/build/rollup-examples.config.js
diff --git a/rollup.config.js b/utils/build/rollup.config.js
similarity index 100%
rename from rollup.config.js
rename to utils/build/rollup.config.js