--- a/tools/tiffcrop.c	2016-11-18 19:45:30.000000000 -0800
+++ b/tools/tiffcrop.c	2017-04-10 16:09:02.227943742 -0700
@@ -3698,7 +3698,7 @@ static int readContigStripsIntoBuffer (T
                                   (unsigned long) strip, (unsigned long)rows);
                         return 0;
                 }
-                bufp += bytes_read;
+                bufp += stripsize;
         }
 
         return 1;