diff --git a/package.json b/package.json
index 6d8c770..dd0edd1 100644
--- a/package.json
+++ b/package.json
@@ -33,5 +33,6 @@
     "test": "node tests/index.js",
     "test:browsers": "airtap -- tests/index.js"
   },
-  "license": "MIT"
-}
+  "license": "MIT",
+  "sideEffects": false
+}
\ No newline at end of file