diff --git a/tftpd.h b/tftpd.h
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index 945065e..4c2f214 100644
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--- a/tftpd.h
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+++ b/tftpd.h
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@@ -46,7 +46,7 @@ struct thread_data {
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char *mc_addr; /* multicast address */
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struct sockaddr_storage sa_mcast;
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union ip_mreq_storage mcastaddr;
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- u_char mcast_ttl;
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+ unsigned char mcast_ttl;
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/*
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* Self can read/write until client_ready is set. Then only allowed to read.
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