diff --git a/test/source/unoapi_test.cxx b/test/source/unoapi_test.cxx
index 277d611cf122..3dcaa35b699e 100644
--- a/test/source/unoapi_test.cxx
+++ b/test/source/unoapi_test.cxx
@@ -211,7 +211,11 @@ std::unique_ptr<vcl::pdf::PDFiumDocument> UnoApiTest::parsePDFExport(const OStri
     }
     std::unique_ptr<vcl::pdf::PDFiumDocument> pPdfDocument
         = pPDFium->openDocument(maMemory.GetData(), maMemory.GetSize(), rPassword);
-    CPPUNIT_ASSERT(pPdfDocument);
+    if (!pPdfDocument)
+    {
+        OString aError = OUStringToOString(pPDFium->getLastError(), RTL_TEXTENCODING_UTF8);
+        CPPUNIT_ASSERT_MESSAGE(aError.getStr(), pPdfDocument);
+    }
     return pPdfDocument;
 }