diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport9.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport9.cxx
index f381de9c9032..ba35ee12fdc8 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport9.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport9.cxx
@@ -1000,6 +1000,7 @@ DECLARE_OOXMLEXPORT_TEST(testWatermarkLayer, "watermark-layer.docx")
     // Watermark was not visible if page background was set.
 
     SwXTextDocument* pTextDoc = dynamic_cast<SwXTextDocument*>(mxComponent.get());
+    CPPUNIT_ASSERT(pTextDoc);
     SdrPage* pPage = pTextDoc->GetDocShell()->GetDoc()->getIDocumentDrawModelAccess().GetDrawModel()->GetPage(0);
     SdrObject* pObject = pPage->GetObj(0);