diff --git a/Makefile b/Makefile
index 2f6161d299..d16892dd1d 100644
--- a/Makefile
+++ b/Makefile
@@ -43,6 +43,8 @@ build:
 	node bin/cache-templates
 
 	node $(BROWSERIFY_CMD) -e lib/6to5/polyfill.js >dist/polyfill.js
+	node $(UGLIFY_CMD) dist/polyfill.js >dist/polyfill.min.js
+
 	node $(BROWSERIFY_CMD) lib/6to5/browser.js -s to5 >dist/6to5.js
 	node $(UGLIFY_CMD) dist/6to5.js >dist/6to5.min.js
 
@@ -54,8 +56,8 @@ publish:
 	make test
 
 	make build
-	cp dist/6to5.js browser.js
-	cp dist/polyfill.js polyfill.js
+	cp dist/6to5.min.js browser.js
+	cp dist/polyfill.min.js polyfill.js
 
 	node bin/6to5-runtime >runtime.js