diff --git a/src/sniffer.c b/src/sniffer.c
index 2915a054a..393ce3472 100644
--- a/src/sniffer.c
+++ b/src/sniffer.c
@@ -1102,7 +1102,8 @@ static int SetNamedPrivateKey(const char* name, const char* address, int port,
         }
         InitSnifferServer(sniffer);
 
-        XSTRNCPY(sniffer->address, address, MAX_SERVER_ADDRESS);
+        XSTRNCPY(sniffer->address, address, MAX_SERVER_ADDRESS-1);
+        sniffer->address[MAX_SERVER_ADDRESS-1] = '\0';
         sniffer->server = serverIp;
         sniffer->port = port;