diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..85de9cf
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1 @@
+src
diff --git a/package.json b/package.json
index 84eee26..23df625 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,8 @@
   "bin": "./bin/themer.js",
   "scripts": {
     "build": "babel --out-dir lib src",
-    "start": "watch 'yarn run build' src"
+    "start": "watch 'yarn run build' src",
+    "prepublish": "yarn run build"
   },
   "dependencies": {
     "minimist": "^1.2.0",