diff --git sw/source/core/text/portxt.cxx sw/source/core/text/portxt.cxx
index cd80a70..f5132c1 100644
--- sw/source/core/text/portxt.cxx
+++ sw/source/core/text/portxt.cxx
@@ -826,7 +826,7 @@ void SwFieldFormPortion::Paint( const SwTxtPaintInfo& rInf ) const
     {
         if ( pBM->GetFieldname( ).equalsAscii( ODF_FORMCHECKBOX ) )
         { // a checkbox...
-            ICheckboxFieldmark* pCheckboxFm = dynamic_cast< ICheckboxFieldmark* >(pBM);
+            ICheckboxFieldmark* pCheckboxFm = reinterpret_cast< ICheckboxFieldmark* >(pBM);
             bool checked = pCheckboxFm->IsChecked();
             rInf.DrawCheckBox(*this, checked);
         }
diff --git sw/source/filter/ww8/wrtww8.cxx sw/source/filter/ww8/wrtww8.cxx
index f8b34bb..4aab94c 100644
--- sw/source/filter/ww8/wrtww8.cxx
+++ sw/source/filter/ww8/wrtww8.cxx
@@ -3517,7 +3517,9 @@ void WW8Export::WriteFormData( const ::sw::mark::IFieldmark& rFieldmark )
         return;

     const ::sw::mark::IFieldmark* pFieldmark = &rFieldmark;
-    const ::sw::mark::ICheckboxFieldmark* pAsCheckbox = dynamic_cast< const ::sw::mark::ICheckboxFieldmark* >( pFieldmark );
+    const ::sw::mark::ICheckboxFieldmark* pAsCheckbox = NULL;
+    if ( rFieldmark.GetFieldname().equalsAsciiL( RTL_CONSTASCII_STRINGPARAM( ODF_FORMCHECKBOX ) ) )
+        pAsCheckbox = reinterpret_cast< const ::sw::mark::ICheckboxFieldmark* >( pFieldmark );


     OSL_ENSURE(rFieldmark.GetFieldname().equalsAscii( ODF_FORMTEXT ) || rFieldmark.GetFieldname().equalsAscii( ODF_FORMDROPDOWN ) || rFieldmark.GetFieldname().equalsAscii( ODF_FORMCHECKBOX ), "Unknown field type!!!");
diff --git sw/source/filter/ww8/ww8par3.cxx sw/source/filter/ww8/ww8par3.cxx
index ce066fc..ba636b3 100644
--- sw/source/filter/ww8/ww8par3.cxx
+++ sw/source/filter/ww8/ww8par3.cxx
@@ -227,7 +227,7 @@ eF_ResT SwWW8ImplReader::Read_F_FormCheckBox( WW8FieldDesc* pF, String& rStr )
         OSL_ENSURE(pFieldmark!=NULL, "hmmm; why was the bookmark not created?");
         if (pFieldmark!=NULL) {
             IFieldmark::parameter_map_t* const pParameters = pFieldmark->GetParameters();
-            ICheckboxFieldmark* pCheckboxFm = dynamic_cast<ICheckboxFieldmark*>(pFieldmark);
+            ICheckboxFieldmark* pCheckboxFm = reinterpret_cast<ICheckboxFieldmark*>(pFieldmark);
             (*pParameters)[::rtl::OUString::createFromAscii(ODF_FORMCHECKBOX_NAME)] = uno::makeAny(::rtl::OUString(aFormula.sTitle));
             (*pParameters)[::rtl::OUString::createFromAscii(ODF_FORMCHECKBOX_HELPTEXT)] = uno::makeAny(::rtl::OUString(aFormula.sToolTip));
             if(pCheckboxFm)
diff --git sw/source/ui/docvw/edtwin.cxx sw/source/ui/docvw/edtwin.cxx
index 4fa1c49..7f35b9a 100644
--- sw/source/ui/docvw/edtwin.cxx
+++ sw/source/ui/docvw/edtwin.cxx
@@ -2291,8 +2291,9 @@ KEYINPUT_CHECKTABLE_INSDEL:
         case KS_InsChar:
             if (rSh.GetChar(FALSE)==CH_TXT_ATR_FORMELEMENT)
             {
-                ::sw::mark::ICheckboxFieldmark* pFieldmark =
-                    dynamic_cast< ::sw::mark::ICheckboxFieldmark* >
+                ::sw::mark::ICheckboxFieldmark* pFieldmark = NULL;
+                if ( rSh.GetCurrentFieldmark() && rSh.GetCurrentFieldmark()->GetFieldname().equalsAsciiL( RTL_CONSTASCII_STRINGPARAM( ODF_FORMCHECKBOX ) ) )
+                    pFieldmark = reinterpret_cast< ::sw::mark::ICheckboxFieldmark* >
                         (rSh.GetCurrentFieldmark());
                 OSL_ENSURE(pFieldmark,
                     "Where is my FieldMark??");
@@ -4297,7 +4298,7 @@ void SwEditWin::MouseButtonUp(const MouseEvent& rMEvt)
                                     //SwDoc *pDoc=pDocSh->GetDoc();
                                     if (fieldBM->GetFieldname( ).equalsAscii( ODF_FORMCHECKBOX ) )
                                     {
-                                        ICheckboxFieldmark* pCheckboxFm = dynamic_cast<ICheckboxFieldmark*>(fieldBM);
+                                        ICheckboxFieldmark* pCheckboxFm = reinterpret_cast<ICheckboxFieldmark*>(fieldBM);
                                         pCheckboxFm->SetChecked(!pCheckboxFm->IsChecked());
                                         pCheckboxFm->Invalidate();
                                         rSh.InvalidateWindows( rView.GetVisArea() );