diff --git a/build.config.js b/build.config.js
new file mode 100644
index 0000000..6ad5e9d
--- /dev/null
+++ b/build.config.js
@@ -0,0 +1,6 @@
+export default {
+    entries: ["./index.js"],
+    rollup: {
+        emitCJS: true,
+    },
+};
\ No newline at end of file
diff --git a/src/index.js b/index.js
similarity index 100%
rename from src/index.js
rename to index.js
diff --git a/package.json b/package.json
index e361f99..a3d553d 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,6 @@
     "node": ">=8.0.0"
   },
   "license": "MIT",
-  "type": "module",
   "exports": {
     ".": {
       "import": "./dist/index.mjs",
diff --git a/tests/crc.test.js b/tests/crc.test.js
index 048801b..9b8cb27 100644
--- a/tests/crc.test.js
+++ b/tests/crc.test.js
@@ -1,4 +1,4 @@
-const crc32 = require('..');
+const crc32 = require('../index.js');
 const test = require('tap').test;
 
 test('simple crc32 is no problem', function (t) {