diff --git a/package/source/xstor/oseekinstream.cxx b/package/source/xstor/oseekinstream.cxx
index f5e3d644d673..c791b96fe5e2 100644
--- a/package/source/xstor/oseekinstream.cxx
+++ b/package/source/xstor/oseekinstream.cxx
@@ -32,7 +32,7 @@ OInputSeekStream::OInputSeekStream( OWriteStream_Impl& pImpl,
                                     uno::Reference < io::XInputStream > const & xStream,
                                     const uno::Sequence< beans::PropertyValue >& aProps,
                                     sal_Int32 nStorageType )
-: OInputCompStream( pImpl, xStream, aProps, nStorageType )
+    : OInputSeekStream_BASE(pImpl, xStream, aProps, nStorageType)
 {
     m_xSeekable.set( m_xStream, uno::UNO_QUERY );
     OSL_ENSURE( m_xSeekable.is(), "No seeking support!" );
@@ -41,7 +41,7 @@ OInputSeekStream::OInputSeekStream( OWriteStream_Impl& pImpl,
 OInputSeekStream::OInputSeekStream( uno::Reference < io::XInputStream > const & xStream,
                                     const uno::Sequence< beans::PropertyValue >& aProps,
                                     sal_Int32 nStorageType )
-: OInputCompStream( xStream, aProps, nStorageType )
+    : OInputSeekStream_BASE(xStream, aProps, nStorageType)
 {
     m_xSeekable.set( m_xStream, uno::UNO_QUERY );
     OSL_ENSURE( m_xSeekable.is(), "No seeking support!" );
@@ -51,42 +51,6 @@ OInputSeekStream::~OInputSeekStream()
 {
 }
 
-uno::Sequence< uno::Type > SAL_CALL OInputSeekStream::getTypes()
-{
-    static cppu::OTypeCollection aTypeCollection(cppu::UnoType<io::XSeekable>::get(),
-                                                   OInputCompStream::getTypes());
-
-    return aTypeCollection.getTypes();
-}
-
-uno::Any SAL_CALL OInputSeekStream::queryInterface( const uno::Type& rType )
-{
-    // Attention:
-    //  Don't use mutex or guard in this method!!! Is a method of XInterface.
-
-    uno::Any aReturn( ::cppu::queryInterface( rType,
-                                           static_cast< io::XSeekable* >( this ) ) );
-
-    if ( aReturn.hasValue() )
-    {
-        return aReturn ;
-    }
-
-    return OInputCompStream::queryInterface( rType ) ;
-}
-
-void SAL_CALL OInputSeekStream::acquire()
-        noexcept
-{
-    OInputCompStream::acquire();
-}
-
-void SAL_CALL OInputSeekStream::release()
-        noexcept
-{
-    OInputCompStream::release();
-}
-
 void SAL_CALL OInputSeekStream::seek( sal_Int64 location )
 {
     ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );
diff --git a/package/source/xstor/oseekinstream.hxx b/package/source/xstor/oseekinstream.hxx
index a77289e9a3ed..8ecc55964c45 100644
--- a/package/source/xstor/oseekinstream.hxx
+++ b/package/source/xstor/oseekinstream.hxx
@@ -24,8 +24,8 @@
 
 #include "ocompinstream.hxx"
 
-class OInputSeekStream final : public OInputCompStream
-                        , public css::io::XSeekable
+using OInputSeekStream_BASE = cppu::ImplInheritanceHelper<OInputCompStream, css::io::XSeekable>;
+class OInputSeekStream final : public OInputSeekStream_BASE
 {
     css::uno::Reference < css::io::XSeekable > m_xSeekable;
 
@@ -41,18 +41,10 @@ public:
 
     virtual ~OInputSeekStream() override;
 
-    virtual css::uno::Sequence< css::uno::Type > SAL_CALL getTypes() override;
-
-    // XInterface
-    virtual css::uno::Any SAL_CALL queryInterface( const css::uno::Type& rType ) override;
-    virtual void SAL_CALL acquire() noexcept override;
-    virtual void SAL_CALL release() noexcept override;
-
     //XSeekable
     virtual void SAL_CALL seek( sal_Int64 location ) override;
     virtual sal_Int64 SAL_CALL getPosition() override;
     virtual sal_Int64 SAL_CALL getLength() override;
-
 };
 
 #endif