diff --git a/src/Context.cc b/src/Context.cc
index 58f166f2..bef22e54 100644
--- a/src/Context.cc
+++ b/src/Context.cc
@@ -280,7 +280,8 @@ Context::Context(bool standalone,
      !uriListParser) {
     global::cout()->printf("%s\n", MSG_NO_FILES_TO_DOWNLOAD);
   } else {
-    reqinfo.reset(new MultiUrlRequestInfo(requestGroups, op, getStatCalc(op),
+    reqinfo.reset(new MultiUrlRequestInfo(std::move(requestGroups),
+                                          op, getStatCalc(op),
                                           getSummaryOut(op),
                                           uriListParser));
   }
diff --git a/src/DownloadEngineFactory.cc b/src/DownloadEngineFactory.cc
index 8c7ace30..3f3bad54 100644
--- a/src/DownloadEngineFactory.cc
+++ b/src/DownloadEngineFactory.cc
@@ -86,7 +86,7 @@ DownloadEngineFactory::DownloadEngineFactory() {}
 
 std::shared_ptr<DownloadEngine>
 DownloadEngineFactory::newDownloadEngine
-(Option* op, const std::vector<std::shared_ptr<RequestGroup> >& requestGroups)
+(Option* op, std::vector<std::shared_ptr<RequestGroup> > requestGroups)
 {
   const size_t MAX_CONCURRENT_DOWNLOADS =
     op->getAsInt(PREF_MAX_CONCURRENT_DOWNLOADS);
@@ -149,9 +149,8 @@ DownloadEngineFactory::newDownloadEngine
   std::shared_ptr<DownloadEngine> e(new DownloadEngine(eventPoll));
   e->setOption(op);
 
-  std::shared_ptr<RequestGroupMan>
-    requestGroupMan(new RequestGroupMan(requestGroups, MAX_CONCURRENT_DOWNLOADS,
-                                        op));
+  auto requestGroupMan = std::make_shared<RequestGroupMan>
+    (std::move(requestGroups), MAX_CONCURRENT_DOWNLOADS, op);
   requestGroupMan->initWrDiskCache();
   e->setRequestGroupMan(requestGroupMan);
   e->setFileAllocationMan
diff --git a/src/DownloadEngineFactory.h b/src/DownloadEngineFactory.h
index 14c75b5a..7675971c 100644
--- a/src/DownloadEngineFactory.h
+++ b/src/DownloadEngineFactory.h
@@ -52,7 +52,7 @@ public:
 
   std::shared_ptr<DownloadEngine>
   newDownloadEngine
-  (Option* op, const std::vector<std::shared_ptr<RequestGroup> >& requestGroups);
+  (Option* op, std::vector<std::shared_ptr<RequestGroup> > requestGroups);
 };
 
 } // namespace aria2
diff --git a/src/MultiUrlRequestInfo.cc b/src/MultiUrlRequestInfo.cc
index e99d4f7d..bb054469 100644
--- a/src/MultiUrlRequestInfo.cc
+++ b/src/MultiUrlRequestInfo.cc
@@ -104,12 +104,13 @@ void handler(int signal) {
 } // namespace
 
 MultiUrlRequestInfo::MultiUrlRequestInfo
-(std::vector<std::shared_ptr<RequestGroup> >& requestGroups,
+(std::vector<std::shared_ptr<RequestGroup> > requestGroups,
  const std::shared_ptr<Option>& op,
  const std::shared_ptr<StatCalc>& statCalc,
  const std::shared_ptr<OutputFile>& summaryOut,
  const std::shared_ptr<UriListParser>& uriListParser)
-  : option_(op),
+  : requestGroups_(std::move(requestGroups)),
+    option_(op),
     statCalc_(statCalc),
     summaryOut_(summaryOut),
     uriListParser_(uriListParser),
@@ -120,7 +121,6 @@ MultiUrlRequestInfo::MultiUrlRequestInfo
 #else // !HAVE_SIGACTION
   mask_ = 0;
 #endif // !HAVE_SIGACTION
-  requestGroups_.swap(requestGroups);
 }
 
 MultiUrlRequestInfo::~MultiUrlRequestInfo() {}
@@ -160,10 +160,9 @@ int MultiUrlRequestInfo::prepare()
     }
 #endif // ENABLE_SSL
 
+    // RequestGroups will be transferred to DownloadEngine
     e_ = DownloadEngineFactory().newDownloadEngine(option_.get(),
-                                                   requestGroups_);
-    // Avoid keeping RequestGroups alive longer than necessary
-    requestGroups_.clear();
+                                                   std::move(requestGroups_));
 
 #ifdef ENABLE_WEBSOCKET
     if(option_->getAsBool(PREF_ENABLE_RPC)) {
diff --git a/src/MultiUrlRequestInfo.h b/src/MultiUrlRequestInfo.h
index 82850114..b630983d 100644
--- a/src/MultiUrlRequestInfo.h
+++ b/src/MultiUrlRequestInfo.h
@@ -81,7 +81,7 @@ public:
    * requestGroups.
    */
   MultiUrlRequestInfo
-  (std::vector<std::shared_ptr<RequestGroup> >& requestGroups,
+  (std::vector<std::shared_ptr<RequestGroup> > requestGroups,
    const std::shared_ptr<Option>& op,
    const std::shared_ptr<StatCalc>& statCalc,
    const std::shared_ptr<OutputFile>& summaryOut,
diff --git a/src/RequestGroupMan.cc b/src/RequestGroupMan.cc
index 0d8fb484..106b783d 100644
--- a/src/RequestGroupMan.cc
+++ b/src/RequestGroupMan.cc
@@ -96,7 +96,7 @@ void appendReservedGroup(RequestGroupList& list,
 } // namespace
 
 RequestGroupMan::RequestGroupMan
-(const std::vector<std::shared_ptr<RequestGroup> >& requestGroups,
+(std::vector<std::shared_ptr<RequestGroup> > requestGroups,
  int maxSimultaneousDownloads,
  const Option* option)
   : maxSimultaneousDownloads_(maxSimultaneousDownloads),
diff --git a/src/RequestGroupMan.h b/src/RequestGroupMan.h
index 21df6a76..0ffdb476 100644
--- a/src/RequestGroupMan.h
+++ b/src/RequestGroupMan.h
@@ -120,7 +120,7 @@ private:
   void addRequestGroupIndex
   (const std::vector<std::shared_ptr<RequestGroup> >& groups);
 public:
-  RequestGroupMan(const std::vector<std::shared_ptr<RequestGroup> >& requestGroups,
+  RequestGroupMan(std::vector<std::shared_ptr<RequestGroup> > requestGroups,
                   int maxSimultaneousDownloads,
                   const Option* option);