diff --git a/PdfForQtLib/sources/pdfccittfaxdecoder.cpp b/PdfForQtLib/sources/pdfccittfaxdecoder.cpp
index 15da19f..f425173 100644
--- a/PdfForQtLib/sources/pdfccittfaxdecoder.cpp
+++ b/PdfForQtLib/sources/pdfccittfaxdecoder.cpp
@@ -444,7 +444,7 @@ PDFImageData PDFCCITTFaxDecoder::decode()
                 ++index;
             }
 
-            writer.write((isCurrentPixelBlack != m_parameters.hasBlackIsOne) ? 1 : 0);
+            writer.write(isCurrentPixelBlack ? 0 : 1);
         }
         writer.finishLine();