diff --git a/package.json b/package.json
index d15d8b4..20a5f83 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "build": "npm run build-debug && npm run build-min",
     "build-debug": "browserify src/clipboard.js -s Clipboard -o dist/clipboard.js",
     "build-min": "uglify -s dist/clipboard.js -o dist/clipboard.min.js",
-    "build-watch": "watchify src/clipboard.js -o dist/clipboard.js -v",
+    "build-watch": "watchify src/clipboard.js -s Clipboard -o dist/clipboard.js -v",
     "test": "npm run test-browser && npm run test-server",
     "test-browser": "karma start --single-run",
     "test-server": "mocha test/module-systems.js"