diff --git a/package.json b/package.json
index 4176ea0..b399c78 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
 	"description": "Gets the job done when JSON.stringify can't",
 	"version": "5.0.0",
 	"repository": "Rich-Harris/devalue",
+	"sideEffects": false,
 	"exports": {
 		".": {
 			"types": "./types/index.d.ts",