diff --git a/bindings/gumjs/runtime/message-dispatcher.js b/bindings/gumjs/runtime/message-dispatcher.js
index 035fe03db..6661d0414 100644
--- a/bindings/gumjs/runtime/message-dispatcher.js
+++ b/bindings/gumjs/runtime/message-dispatcher.js
@@ -71,7 +71,7 @@ function MessageDispatcher() {
     params = params || [];
 
     if (result instanceof ArrayBuffer)
-      send(['frida:rpc', id, type, {}].concat(params), result);
+      send(['frida:rpc', id, type, undefined].concat(params), result);
     else
       send(['frida:rpc', id, type, result].concat(params));
   }
diff --git a/tests/gumjs/script.c b/tests/gumjs/script.c
index 4642a9333..0dbd57d4f 100644
--- a/tests/gumjs/script.c
+++ b/tests/gumjs/script.c
@@ -6066,7 +6066,7 @@ TESTCASE (method_can_return_binary_data)
           "return buf.readByteArray(2);"
       "};");
   POST_MESSAGE ("[\"frida:rpc\",42,\"call\",\"read\",[]]");
-  EXPECT_SEND_MESSAGE_WITH_PAYLOAD_AND_DATA ("[\"frida:rpc\",42,\"ok\",{}]",
+  EXPECT_SEND_MESSAGE_WITH_PAYLOAD_AND_DATA ("[\"frida:rpc\",42,\"ok\",null]",
       "59 6f");
 }