1 files changed, 6 insertions, 0 deletions

diff --git a/busybox/networking/tftp.c b/busybox/networking/tftp.c
index 3c947318b..47fc3879e 100644
--- a/busybox/networking/tftp.c
+++ b/busybox/networking/tftp.c
@@ -458,6 +458,12 @@ static inline int tftp(const int cmd, const struct hostent *host,
                                 opcode = TFTP_ACK;
                                 continue;
                         }
+                        /* in case the last ack disappeared into the ether */
+                        if ( tmp == (block_nr - 1) ) {
+                                --block_nr;
+                                opcode = TFTP_ACK;
+                                continue;
+                        }
                 }
 
                 if (cmd_put && (opcode == TFTP_ACK)) {