diff --git a/build.ts b/build.ts
index e7d3156..ae77068 100644
--- a/build.ts
+++ b/build.ts
@@ -48,6 +48,7 @@ let configs = pages.map(page => {
       watch: {
          clearScreen: false
       },
+      treeshake: production,
       plugins: [
          (typescript as any)({
             tsconfig: "./src/tsconfig.json"
@@ -121,7 +122,6 @@ if (process.argv.indexOf("-w") >= 0) {
 } else {
    start = process.hrtime();
    Promise.all(configs.map(config => {
-      config.treeshake = true;
       return rollup.rollup(config).then((value) => {
          return value.write(Array.isArray(config.output) ? config.output[0] : config.output);
       }).catch(err => {