diff --git a/micromark/.npmignore b/micromark/.npmignore
index a268999d..cdb983cb 100644
--- a/micromark/.npmignore
+++ b/micromark/.npmignore
@@ -1,3 +1,4 @@
 exports.mjs
 micromark.dev.cjs
+micromark-browser.dev.js
 webpack.config.js