diff --git a/package.json b/package.json
index b3f7423..0912d96 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,9 @@
   "description": "A modern fork of sylvester.",
   "type": "module",
   "main": "src/index.js",
+  "files": [
+    "!/src/*.test.js"
+  ],
   "scripts": {
     "test": "vitest"
   },