diff --git a/src/aria2.cpp b/src/aria2.cpp
index 97243ea7e..2a5fa4661 100644
--- a/src/aria2.cpp
+++ b/src/aria2.cpp
@@ -101,7 +101,7 @@ std::string Aria2::doRequest(const MethodCall& methodCall)
 std::string Aria2::addUri(const std::vector<std::string>& uris)
 {
   MethodCall methodCall("aria2.addUri", m_secret);
-  auto uriParams = methodCall.getParams().addParam().getValue().getArray();
+  auto uriParams = methodCall.newParamValue().getArray();
   for (auto& uri : uris) {
     uriParams.addValue().set(uri);
   }
@@ -118,9 +118,9 @@ std::string Aria2::addUri(const std::vector<std::string>& uris)
 std::string Aria2::tellStatus(const std::string& gid, const std::vector<std::string>& statusKey)
 {
   MethodCall methodCall("aria2.tellStatus", m_secret);
-  methodCall.getParams().addParam().getValue().set(gid);
+  methodCall.newParamValue().set(gid);
   if (!statusKey.empty()) {
-    auto statusArray = methodCall.getParams().addParam().getValue().getArray();
+    auto statusArray = methodCall.newParamValue().getArray();
     for (auto& key : statusKey) {
       statusArray.addValue().set(key);
     }
diff --git a/src/xmlrpc.h b/src/xmlrpc.h
index 65659ddf7..8e6c6d306 100644
--- a/src/xmlrpc.h
+++ b/src/xmlrpc.h
@@ -215,6 +215,10 @@ class MethodCall {
       return Params(m_doc.child("methodCall").child("params"));
     }
 
+    Value newParamValue() {
+      return getParams().addParam().getValue();
+    }
+
     std::string toString() const {
       return nodeToString(m_doc);
     }
@@ -236,11 +240,19 @@ class MethodResponse {
       return Params(params);
     }
 
+    Value getParamValue(int index) const {
+      return getParams().getParam(index).getValue();
+    }
+
+    bool isFault() const {
+      return (!!m_doc.child("methodResponse").child("fault"));
+    }
+
     Fault getFault() const {
       auto fault = m_doc.child("methodResponse").child("fault");
       if (!fault)
         throw InvalidRPCNode("No fault");
-      return Fault(fault);
+      return Fault(fault.child("value").child("struct"));
     }
 };