diff --git a/xmlsecurity/inc/framework/signatureverifierimpl.hxx b/xmlsecurity/inc/framework/signatureverifierimpl.hxx
index 15c79643e0aa..29d286d7ee57 100644
--- a/xmlsecurity/inc/framework/signatureverifierimpl.hxx
+++ b/xmlsecurity/inc/framework/signatureverifierimpl.hxx
@@ -22,6 +22,7 @@
 #include <com/sun/star/xml/crypto/sax/XSignatureVerifyResultBroadcaster.hpp>
 #include <com/sun/star/lang/XInitialization.hpp>
 #include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
 #include <cppuhelper/implbase.hxx>
 
 #include <xmlsecuritydllapi.h>
@@ -35,7 +36,8 @@ typedef cppu::ImplInheritanceHelper
     SignatureEngine,
     css::xml::crypto::sax::XSignatureVerifyResultBroadcaster,
     css::lang::XInitialization,
-    css::lang::XServiceInfo
+    css::lang::XServiceInfo,
+    css::lang::XUnoTunnel
 > SignatureVerifierImpl_Base;
 
 class SignatureVerifierImpl final : public SignatureVerifierImpl_Base
@@ -74,6 +76,9 @@ public:
     virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
     virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames(  ) override;
 
+    sal_Int64 SAL_CALL getSomething(css::uno::Sequence<sal_Int8> const & aIdentifier) override;
+    static css::uno::Sequence<sal_Int8> const & getUnoTunnelId();
+
     void updateSignature( const css::uno::Reference< css::xml::crypto::XXMLSignature >& xSignature,
                           const css::uno::Reference< css::xml::crypto::XXMLSecurityContext >& xContext ) { m_xXMLSignature = xSignature; m_xXMLSecurityContext = xContext; }
 };
diff --git a/xmlsecurity/source/framework/signatureverifierimpl.cxx b/xmlsecurity/source/framework/signatureverifierimpl.cxx
index 44e9e4c0a46c..3489dab31bed 100644
--- a/xmlsecurity/source/framework/signatureverifierimpl.cxx
+++ b/xmlsecurity/source/framework/signatureverifierimpl.cxx
@@ -21,6 +21,7 @@
 #include <framework/signatureverifierimpl.hxx>
 #include <framework/xmlsignaturetemplateimpl.hxx>
 #include <com/sun/star/xml/crypto/XXMLSignatureTemplate.hpp>
+#include <comphelper/servicehelper.hxx>
 #include <cppuhelper/supportsservice.hxx>
 #include <osl/diagnose.h>
 #include <rtl/ref.hxx>
@@ -127,4 +128,13 @@ css::uno::Sequence< OUString > SAL_CALL SignatureVerifierImpl::getSupportedServi
     return SignatureVerifierImpl_getSupportedServiceNames();
 }
 
+sal_Int64 SignatureVerifierImpl::getSomething(css::uno::Sequence<sal_Int8> const & aIdentifier) {
+    return comphelper::getSomethingImpl(aIdentifier, this);
+}
+
+css::uno::Sequence<sal_Int8> const & SignatureVerifierImpl::getUnoTunnelId() {
+    static comphelper::UnoIdInit const id;
+    return id.getSeq();
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xsecverify.cxx b/xmlsecurity/source/helper/xsecverify.cxx
index c45bece5fed9..e2d3fc8b5050 100644
--- a/xmlsecurity/source/helper/xsecverify.cxx
+++ b/xmlsecurity/source/helper/xsecverify.cxx
@@ -42,6 +42,7 @@
 #include <comphelper/processfactory.hxx>
 #include <comphelper/propertyvalue.hxx>
 #include <comphelper/seqstream.hxx>
+#include <comphelper/servicehelper.hxx>
 
 namespace com::sun::star::graphic { class XGraphic; }
 
@@ -133,8 +134,8 @@ void XSecController::switchGpgSignature()
         return;
 
     SignatureVerifierImpl* pImpl=
-        dynamic_cast<SignatureVerifierImpl*>(
-            m_vInternalSignatureInformations.back().xReferenceResolvedListener.get());
+        comphelper::getFromUnoTunnel<SignatureVerifierImpl>(
+            m_vInternalSignatureInformations.back().xReferenceResolvedListener);
     if (pImpl)
     {
         css::uno::Reference<css::xml::crypto::XSEInitializer> xGpgSEInitializer(