diff --git a/jso/apis/src/main/java/org/teavm/jso/dom/events/MessageEvent.java b/jso/apis/src/main/java/org/teavm/jso/dom/events/MessageEvent.java
index 64715f67e..271f9b24a 100644
--- a/jso/apis/src/main/java/org/teavm/jso/dom/events/MessageEvent.java
+++ b/jso/apis/src/main/java/org/teavm/jso/dom/events/MessageEvent.java
@@ -15,12 +15,13 @@
  */
 package org.teavm.jso.dom.events;
 
+import org.teavm.jso.JSObject;
 import org.teavm.jso.JSProperty;
 import org.teavm.jso.typedarrays.ArrayBuffer;
 
 public interface MessageEvent extends Event {
     @JSProperty
-    Object getData();
+    JSObject getData();
 
     @JSProperty("data")
     String getDataAsString();