diff --git a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
index cad73681efff..68b29fd2d3c7 100644
--- a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
+++ b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
@@ -584,8 +584,7 @@ uno::Sequence< uno::Reference < XCertificate > > SecurityEnvironment_MSCryptImpl
     chainPara.cbSize = sizeof( CERT_CHAIN_PARA ) ;
     chainPara.RequestedUsage = certUsage ;
 
-    uno::Reference< XUnoTunnel > xCertTunnel( begin, uno::UNO_QUERY_THROW ) ;
-    const auto* xcert = comphelper::getFromUnoTunnel<X509Certificate_MSCryptImpl>(xCertTunnel);
+    const auto* xcert = dynamic_cast<X509Certificate_MSCryptImpl*>(begin.get());
     if( xcert == nullptr ) {
         throw uno::RuntimeException() ;
     }
@@ -805,11 +804,9 @@ sal_Int32 SecurityEnvironment_MSCryptImpl::verifyCertificate(
     PCCERT_CHAIN_CONTEXT pChainContext = nullptr;
     PCCERT_CONTEXT pCertContext = nullptr;
 
-    uno::Reference< XUnoTunnel > xCertTunnel( aCert, uno::UNO_QUERY_THROW ) ;
-
     SAL_INFO("xmlsecurity.xmlsec", "Start verification of certificate: " << aCert->getSubjectName());
 
-    const auto* xcert = comphelper::getFromUnoTunnel<X509Certificate_MSCryptImpl>(xCertTunnel);
+    const auto* xcert = dynamic_cast<X509Certificate_MSCryptImpl*>(aCert.get());
     if( xcert == nullptr ) {
         throw uno::RuntimeException() ;
     }
@@ -973,8 +970,7 @@ sal_Int32 SecurityEnvironment_MSCryptImpl::getCertificateCharacters( const css::
     sal_Int32 characters ;
     PCCERT_CONTEXT pCertContext ;
 
-    uno::Reference< XUnoTunnel > xCertTunnel( aCert, uno::UNO_QUERY_THROW ) ;
-    const auto* xcert = comphelper::getFromUnoTunnel<X509Certificate_MSCryptImpl>(xCertTunnel);
+    const auto* xcert = dynamic_cast<X509Certificate_MSCryptImpl*>(aCert.get());
     if( xcert == nullptr ) {
         throw uno::RuntimeException() ;
     }
diff --git a/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx
index 88bf6169bf11..9c671d0c21c0 100644
--- a/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx
+++ b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx
@@ -457,9 +457,6 @@ void X509Certificate_MSCryptImpl::setRawCert( Sequence< sal_Int8 > const & rawCe
     }
 }
 
-/* XUnoTunnel */
-UNO3_GETIMPLEMENTATION_IMPL(X509Certificate_MSCryptImpl);
-
 static OUString findOIDDescription(char const *oid)
 {
     OUString ouOID = OUString::createFromAscii( oid );
diff --git a/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx
index 9bd6a34ce68e..ba02281794f6 100644
--- a/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx
+++ b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx
@@ -30,7 +30,6 @@
 #include <cppuhelper/implbase.hxx>
 #include <comphelper/servicehelper.hxx>
 #include <com/sun/star/uno/Exception.hpp>
-#include <com/sun/star/lang/XUnoTunnel.hpp>
 #include <com/sun/star/lang/XServiceInfo.hpp>
 #include <com/sun/star/uno/SecurityException.hpp>
 #include <com/sun/star/security/CertificateKind.hpp>
@@ -39,7 +38,6 @@
 
 class X509Certificate_MSCryptImpl : public ::cppu::WeakImplHelper<
     css::security::XCertificate ,
-    css::lang::XUnoTunnel,
     css::lang::XServiceInfo > , public xmlsecurity::Certificate
 {
     private:
@@ -72,9 +70,6 @@ class X509Certificate_MSCryptImpl : public ::cppu::WeakImplHelper<
 
         virtual sal_Int32 SAL_CALL getCertificateUsage( ) override;
 
-        //Methods from XUnoTunnel
-        UNO3_GETIMPLEMENTATION_DECL(X509Certificate_MSCryptImpl)
-
         /// @see xmlsecurity::Certificate::getSHA256Thumbprint().
         virtual css::uno::Sequence<sal_Int8> getSHA256Thumbprint() override;