diff --git a/src/samplesrc/tftpd.pla b/src/samplesrc/tftpd.pla
index d5f7a50..ea0746c 100644
--- a/src/samplesrc/tftpd.pla
+++ b/src/samplesrc/tftpd.pla
@@ -229,7 +229,7 @@ def writeUDP(ipsrc, portsrc, data, len, param)
             fin
             len = len - t_datPkt
             if netscii
-                xlat($0A, $0D, buff+datBytes, len)
+                xlat($0A, $0D, data+datBytes, len)
             fin
             if fileio:write(ref, data+datBytes, len) <> len
                 puts("WRQ: File write error\n")