diff --git a/emfio/source/reader/wmfreader.cxx b/emfio/source/reader/wmfreader.cxx
index d1e7f85b1c67..58c4d971cb49 100644
--- a/emfio/source/reader/wmfreader.cxx
+++ b/emfio/source/reader/wmfreader.cxx
@@ -711,9 +711,15 @@ namespace emfio
                 bool bOk = nWidth && nHeight && nPlanes == 1 && nBitCount == 1 && nBytesPerScan != 0;
                 if (bOk)
                 {
+                    // must be enough data to fulfil the request
                     bOk = nBytesPerScan <= mpInputStream->remainingSize() / nHeight;
                 }
                 if (bOk)
+                {
+                    // scanline must be large enough to provide all pixels
+                    bOk = nBytesPerScan >= nWidth / 8;
+                }
+                if (bOk)
                 {
                     vcl::bitmap::RawBitmap aBmp( Size( nWidth, nHeight ), 24 );
                     for (sal_uInt16 y = 0; y < nHeight && mpInputStream->good(); ++y)