diff --git a/curve-definitions/lib/esm/package.json b/curve-definitions/lib/esm/package.json
new file mode 100644
index 0000000..1517420
--- /dev/null
+++ b/curve-definitions/lib/esm/package.json
@@ -0,0 +1,7 @@
+{
+  "type": "module",
+  "browser": {
+    "crypto": false,
+    "./crypto": "./esm/cryptoBrowser.js"
+  }
+}