diff --git a/src/slic3r/GUI/MediaFilePanel.cpp b/src/slic3r/GUI/MediaFilePanel.cpp
index 556a3dfb40..9ff4b7fd18 100644
--- a/src/slic3r/GUI/MediaFilePanel.cpp
+++ b/src/slic3r/GUI/MediaFilePanel.cpp
@@ -486,7 +486,7 @@ void MediaFilePanel::fetchUrl(boost::weak_ptr<PrinterFileSystem> wfs)
                 url += "&device=" + m;
                 url += "&net_ver=" + v;
                 url += "&dev_ver=" + dv;
-                url += "&refresh_url=" + boost::lexical_cast<std::string>(refresh_agora_url);
+                url += "&refresh_url=" + boost::lexical_cast<std::string>(&refresh_agora_url);
                 url += "&cli_id=" + wxGetApp().app_config->get("slicer_uuid");
                 url += "&cli_ver=" + std::string(SLIC3R_VERSION);
             }
diff --git a/src/slic3r/GUI/MediaPlayCtrl.cpp b/src/slic3r/GUI/MediaPlayCtrl.cpp
index 867d0be303..923484b0a3 100644
--- a/src/slic3r/GUI/MediaPlayCtrl.cpp
+++ b/src/slic3r/GUI/MediaPlayCtrl.cpp
@@ -331,7 +331,7 @@ void MediaPlayCtrl::Play()
                 url += "&device=" + into_u8(m);
                 url += "&net_ver=" + v;
                 url += "&dev_ver=" + dv;
-                url += "&refresh_url=" + boost::lexical_cast<std::string>(refresh_agora_url);
+                url += "&refresh_url=" + boost::lexical_cast<std::string>(&refresh_agora_url);
                 url += "&cli_id=" + wxGetApp().app_config->get("slicer_uuid");
                 url += "&cli_ver=" + std::string(SLIC3R_VERSION);
             }
@@ -533,7 +533,7 @@ void MediaPlayCtrl::ToggleStream()
             url += "&device=" + m;
             url += "&net_ver=" + v;
             url += "&dev_ver=" + dv;
-            url += "&refresh_url=" + boost::lexical_cast<std::string>(refresh_agora_url);
+            url += "&refresh_url=" + boost::lexical_cast<std::string>(&refresh_agora_url);
             url += "&cli_id=" + wxGetApp().app_config->get("slicer_uuid");
             url += "&cli_ver=" + std::string(SLIC3R_VERSION);
         }