diff --git a/Pdf4QtLibCore/sources/pdfcertificatemanager.cpp b/Pdf4QtLibCore/sources/pdfcertificatemanager.cpp
index 72530be..1cc5fa2 100644
--- a/Pdf4QtLibCore/sources/pdfcertificatemanager.cpp
+++ b/Pdf4QtLibCore/sources/pdfcertificatemanager.cpp
@@ -407,7 +407,6 @@ bool pdf::PDFSignatureFactory::signImpl_Win(const pdf::PDFCertificateEntry& cert
     Q_UNUSED(password);
     Q_UNUSED(data);
     Q_UNUSED(result);
-    Q_UNUSED(isDetermineLengthOnly);
 #endif
 
     return success;