diff --git a/framework/inc/dispatch/oxt_handler.hxx b/framework/inc/dispatch/oxt_handler.hxx
index 7ce5f92e8655..c3676c033ced 100644
--- a/framework/inc/dispatch/oxt_handler.hxx
+++ b/framework/inc/dispatch/oxt_handler.hxx
@@ -20,7 +20,6 @@
 #ifndef INCLUDED_FRAMEWORK_INC_DISPATCH_OXT_HANDLER_HXX
 #define INCLUDED_FRAMEWORK_INC_DISPATCH_OXT_HANDLER_HXX
 
-#include <threadhelp/threadhelpbase.hxx>
 #include <macros/xinterface.hxx>
 #include <macros/xtypeprovider.hxx>
 #include <macros/xserviceinfo.hxx>
@@ -53,11 +52,7 @@ namespace framework{
     @devstatus      ready
     @threadsafe     yes
 *//*-*************************************************************************************************************/
-class Oxt_Handler  :    // baseclasses
-                        // Order is necessary for right initialization!
-                        private ThreadHelpBase
-                        // interfaces
-                    ,   public  ::cppu::WeakImplHelper3<
+class Oxt_Handler  :    public  ::cppu::WeakImplHelper3<
                                     css::lang::XServiceInfo,
                                     css::frame::XNotifyingDispatch, // => XDispatch
                                     css::document::XExtendedFilterDetection >
@@ -114,6 +109,7 @@ class Oxt_Handler  :    // baseclasses
     //  (should be private everyway!)
 
     private:
+        osl::Mutex m_mutex;
 
         css::uno::Reference< css::lang::XMultiServiceFactory >     m_xFactory          ;   /// global uno service factory to create new services
         css::uno::Reference< css::uno::XInterface >                m_xSelfHold         ;   /// we must protect us against dieing during async(!) dispatch() call!
diff --git a/framework/source/dispatch/oxt_handler.cxx b/framework/source/dispatch/oxt_handler.cxx
index b24eaecfa288..488f6b4af290 100644
--- a/framework/source/dispatch/oxt_handler.cxx
+++ b/framework/source/dispatch/oxt_handler.cxx
@@ -18,7 +18,6 @@
  */
 
 #include <dispatch/oxt_handler.hxx>
-#include <threadhelp/guard.hxx>
 #include <threadhelp/transactionguard.hxx>
 #include <services.h>
 #include <unotools/mediadescriptor.hxx>
@@ -60,10 +59,7 @@ DEFINE_INIT_SERVICE                 (   Oxt_Handler,
     @threadsafe yes
 *//*-*************************************************************************************************************/
 Oxt_Handler::Oxt_Handler( const css::uno::Reference< css::lang::XMultiServiceFactory >& xFactory )
-        //  Init baseclasses first
-        :   ThreadHelpBase      (          )
-        // Init member
-        ,   m_xFactory          ( xFactory )
+        :   m_xFactory          ( xFactory )
 {
 }
 
@@ -117,8 +113,7 @@ void SAL_CALL Oxt_Handler::dispatchWithNotification( const css::util::URL& aURL,
                                                      const css::uno::Reference< css::frame::XDispatchResultListener >& xListener )
     throw( css::uno::RuntimeException, std::exception )
 {
-    // SAFE {
-    Guard aLock( m_aLock );
+    osl::MutexGuard g(m_mutex);
 
     OUString sServiceName = "com.sun.star.deployment.ui.PackageManagerDialog";
     css::uno::Sequence< css::uno::Any > lParams(1);
@@ -137,9 +132,6 @@ void SAL_CALL Oxt_Handler::dispatchWithNotification( const css::util::URL& aURL,
         aEvent.State = css::frame::DispatchResultState::SUCCESS;
         xListener->dispatchFinished( aEvent );
     }
-
-    // } SAFE
-    aLock.unlock();
 }
 
 void SAL_CALL Oxt_Handler::dispatch( const css::util::URL&                                  aURL       ,