diff --git a/src/PDF.hs b/src/PDF.hs
index e1e7421..0f18b5f 100644
--- a/src/PDF.hs
+++ b/src/PDF.hs
@@ -182,7 +182,7 @@ readStartXref eolStyle input =
       BS.length input - BS.length eofMarker
       - if BS.last input == BS.last eofMarker then 0 else eolOffset
     startXrefPosition =
-      previous eolLastByte (eofMarkerPosition - eolOffset) input + 1
+      previous eolLastByte (eofMarkerPosition - eolOffset - 1) input + 1
     startXrefLength = eofMarkerPosition - eolOffset - startXrefPosition
 
 parseDocument :: ByteString -> Either ParseError Document