Index: dccp/dccp_ackv.cc
--- dccp/dccp_ackv.cc.orig
+++ dccp/dccp_ackv.cc
@@ -32,7 +32,7 @@
 #include "dccp_ackv.h"
 
 /* Static string representation of packet states */
-char* DCCPAckVector::packet_state_str_[DCCP_NUM_PACKET_STATES] =
+const char* DCCPAckVector::packet_state_str_[DCCP_NUM_PACKET_STATES] =
 {"Received", "ECN-marked", "Reserved", "Not Received" };
 
 //private methods