diff --git a/build-js.sh b/build-js.sh
new file mode 100644
index 0000000..149cb56
--- /dev/null
+++ b/build-js.sh
@@ -0,0 +1,7 @@
+#~!/usr/bin/bash
+
+cp -r src/* build/
+rm -rf build/injections/*
+mkdir -p build/src/injections
+for f in src/injections/*; do uglifyjs $f --compress --mangle -o build/$f; done
+cp build/src/injections/* build/injections/ && rm -rf build/src
\ No newline at end of file
diff --git a/package.json b/package.json
index 869f942..cb2f907 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "build-extensions": "npm run build-firefox && npm run build-chrome",
     "build-firefox": "cd firefox/ && jpm xpi && cd -",
     "build-chrome": "crx pack chrome -o hipchat-emoticons-for-all.crx -p chrome/key.pem",
-    "build-js": "cp -r src/* build/ && rm -rf build/injections && mkdir -p build/src/injections && for f in src/injections/*; do uglifyjs $f --compress --mangle -o build/$f; done && cp build/src/injections/* build/injections/ && rm -rf build/src",
+    "build-js": "bash build-js.sh",
     "build-data-files": "python firefox/build-package.py && python chrome/build-manifest.py",
     "distribute": "cp build/* firefox/data/ && cp build/* chrome/data/",
     "build": "npm run clean && npm run create-dirs && npm install && npm run build-js && npm run distribute && npm run build-data-files && npm run build-extensions",