diff --git a/js/js.libraries/src/core/json.kt b/js/js.libraries/src/core/json.kt
index 8cbec420daf..8a538995103 100644
--- a/js/js.libraries/src/core/json.kt
+++ b/js/js.libraries/src/core/json.kt
@@ -1,6 +1,6 @@
 package kotlin.js
 
-public external class Json() {
+public external interface Json {
     operator fun get(propertyName: String): Any?
     operator fun set(propertyName: String, value: Any?): Unit
 }