Index: tcp/tcp-full.cc
--- tcp/tcp-full.cc.orig
+++ tcp/tcp-full.cc
@@ -549,11 +549,11 @@ FullTcpAgent::prpkt(Packet *pkt)
 		tcph->reason());
 }
 
-char *
+const char *
 FullTcpAgent::flagstr(int hflags)
 {
 	// update this if tcp header flags change
-	static char *flagstrs[28] = {
+	static const char *flagstrs[28] = {
 		"<null>", "<FIN>", "<SYN>", "<SYN,FIN>",	// 0-3
 		"<?>", "<?,FIN>", "<?,SYN>", "<?,SYN,FIN>",	// 4-7
 		"<PSH>", "<PSH,FIN>", "<PSH,SYN>", "<PSH,SYN,FIN>", // 0x08-0x0b
@@ -581,10 +581,10 @@ FullTcpAgent::flagstr(int hflags)
 	return (flagstrs[hflags]);
 }
 
-char *
+const char *
 FullTcpAgent::statestr(int state)
 {
-	static char *statestrs[TCP_NSTATES] = {
+	static const char *statestrs[TCP_NSTATES] = {
 		"CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
 		"ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
 		"LAST_ACK", "FIN_WAIT_2"