diff --git a/include/wx/gtk/webview_webkit.h b/include/wx/gtk/webview_webkit.h
index 75a22e5343..63caf2dc13 100644
--- a/include/wx/gtk/webview_webkit.h
+++ b/include/wx/gtk/webview_webkit.h
@@ -27,6 +27,8 @@ typedef struct _WebKitWebView WebKitWebView;
 // wxWebViewWebKit
 //-----------------------------------------------------------------------------
 
+class wxWebKitRunScriptParams;
+
 class WXDLLIMPEXP_WEBVIEW wxWebViewWebKit : public wxWebView
 {
 public:
@@ -119,13 +121,15 @@ public:
     virtual wxString GetSelectedSource() const wxOVERRIDE;
     virtual void ClearSelection() wxOVERRIDE;
 
-    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const wxOVERRIDE;
 #if wxUSE_WEBVIEW_WEBKIT2
+    virtual void RunScriptAsync(const wxString& javascript, void* clientData = NULL) const wxOVERRIDE;
     virtual bool AddScriptMessageHandler(const wxString& name) wxOVERRIDE;
     virtual bool RemoveScriptMessageHandler(const wxString& name) wxOVERRIDE;
     virtual bool AddUserScript(const wxString& javascript,
         wxWebViewUserScriptInjectionTime injectionTime = wxWEBVIEW_INJECT_AT_DOCUMENT_START) wxOVERRIDE;
     virtual void RemoveAllUserScripts() wxOVERRIDE;
+#else
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const wxOVERRIDE;
 #endif
 
     //Virtual Filesystem Support
@@ -151,6 +155,11 @@ public:
     //create-web-view signal and so we need to send a new window event
     bool m_creating;
 
+#if wxUSE_WEBVIEW_WEBKIT2
+    // This methods needs to be public to make it callable from a callback
+    void ProcessJavaScriptResult(GAsyncResult *res, wxWebKitRunScriptParams* params) const;
+#endif
+
 protected:
     virtual void DoSetPage(const wxString& html, const wxString& baseUrl) wxOVERRIDE;
 
@@ -173,7 +182,6 @@ private:
     bool CanExecuteEditingCommand(const gchar* command) const;
     void SetupWebExtensionServer();
     GDBusProxy *GetExtensionProxy() const;
-    bool RunScriptSync(const wxString& javascript, wxString* output = NULL) const;
 #endif
 
     WebKitWebView *m_web_view;
diff --git a/src/gtk/webview_webkit2.cpp b/src/gtk/webview_webkit2.cpp
index 8fb900ee23..a0161243f9 100644
--- a/src/gtk/webview_webkit2.cpp
+++ b/src/gtk/webview_webkit2.cpp
@@ -1231,6 +1231,13 @@ wxString wxWebViewWebKit::GetPageText() const
     return wxString();
 }
 
+class wxWebKitRunScriptParams
+{
+public:
+    const wxWebViewWebKit* webKitCtrl;
+    void* clientData;
+};
+
 extern "C"
 {
 
@@ -1238,75 +1245,55 @@ static void wxgtk_run_javascript_cb(GObject *,
                                     GAsyncResult *res,
                                     void *user_data)
 {
-    g_object_ref(res);
-
-    GAsyncResult** res_out = static_cast<GAsyncResult**>(user_data);
-    *res_out = res;
+    wxWebKitRunScriptParams* params = static_cast<wxWebKitRunScriptParams*>(user_data);
+    params->webKitCtrl->ProcessJavaScriptResult(res, params);
 }
 
 } // extern "C"
 
-// Run the given script synchronously and return its result in output.
-bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output) const
+void wxWebViewWebKit::ProcessJavaScriptResult(GAsyncResult *res, wxWebKitRunScriptParams* params) const
 {
-    GAsyncResult *result = NULL;
-    webkit_web_view_run_javascript(m_web_view,
-                                   javascript.utf8_str(),
-                                   NULL,
-                                   wxgtk_run_javascript_cb,
-                                   &result);
-
-    GMainContext *main_context = g_main_context_get_thread_default();
-
-    while ( !result )
-        g_main_context_iteration(main_context, TRUE);
-
     wxGtkError error;
     wxWebKitJavascriptResult js_result
                              (
                                 webkit_web_view_run_javascript_finish
                                 (
                                     m_web_view,
-                                    result,
+                                    res,
                                     error.Out()
                                 )
                              );
 
-    // Match g_object_ref() in wxgtk_run_javascript_cb()
-    g_object_unref(result);
-
-    if ( !js_result )
+    if ( js_result )
     {
-        if ( output )
-            *output = error.GetMessage();
-        return false;
+        wxString scriptResult;
+        if ( wxGetStringFromJSResult(js_result, &scriptResult) )
+        {
+            wxString scriptOutput;
+            bool success = wxJSScriptWrapper::ExtractOutput(scriptResult, &scriptOutput);
+            SendScriptResult(params->clientData, success, scriptOutput);
+        }
     }
+    else
+        SendScriptResult(params->clientData, false, error.GetMessage());
 
-    return wxGetStringFromJSResult(js_result, output);
+    delete params;
 }
 
-bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output) const
+void wxWebViewWebKit::RunScriptAsync(const wxString& javascript, void* clientData) const
 {
     wxJSScriptWrapper wrapJS(javascript, wxJSScriptWrapper::JS_OUTPUT_STRING);
 
-    bool success = false;
-    wxString result;
-    wxString scriptOutput;
-    if (RunScriptSync(wrapJS.GetWrappedCode(), &result))
-    {
-        success = wxJSScriptWrapper::ExtractOutput(result, &scriptOutput);
-    }
+    // Collect parameters for access from the callback
+    wxWebKitRunScriptParams* params = new wxWebKitRunScriptParams;
+    params->webKitCtrl = this;
+    params->clientData = clientData;
 
-    if (output)
-        output->assign(scriptOutput);
-
-    if (!success)
-    {
-        wxLogWarning(_("Error running JavaScript: %s"), scriptOutput);
-        return false;
-    }
-    else
-        return true;
+    webkit_web_view_run_javascript(m_web_view,
+                                   wrapJS.GetWrappedCode().utf8_str(),
+                                   NULL,
+                                   wxgtk_run_javascript_cb,
+                                   params);
 }
 
 bool wxWebViewWebKit::AddScriptMessageHandler(const wxString& name)