diff --git a/src/net_server.c b/src/net_server.c
index 49fd7921..380bf9df 100644
--- a/src/net_server.c
+++ b/src/net_server.c
@@ -546,7 +546,7 @@ static net_client_t *NET_SV_FindClient(net_addr_t *addr)
 
 // send a rejection packet to a client
 
-static void NET_SV_SendReject(net_addr_t *addr, char *msg)
+static void NET_SV_SendReject(net_addr_t *addr, const char *msg)
 {
     net_packet_t *packet;