diff --git a/package.json b/package.json
index 7990a2f..2a2dd82 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "serve": "static -p 8080 htdocs/",
     "prepublish": "npm run dist",
     "lint": "grunt lint",
-    "build": "rollup -f umd --name c3 src/index.js > c3.js",
+    "build": "rollup -f umd --name c3 --globals d3:d3 src/index.js > c3.js",
     "minify": "grunt minify",
     "test": "npm run build && npm run lint && karma start karma.conf.js",
     "dist": "npm run build && npm run minify",