diff --git a/build.sh b/build.sh
index 71a481b..f5e657f 100755
--- a/build.sh
+++ b/build.sh
@@ -12,6 +12,7 @@ cd ffprobe-wasm-app
 docker-compose run ffprobe-wasm make
 cd ..
 cp -R ffprobe-wasm-app/dist dist
+mv dist/ffprobe-wasm.js dist/ffprobe-wasm.mjs
 node scripts/replace.js
 cp src/*.d.* dist