diff --git a/master/slave_config.c b/master/slave_config.c
index ccbf7abf..e331aa81 100644
--- a/master/slave_config.c
+++ b/master/slave_config.c
@@ -1495,7 +1495,7 @@ int ecrt_slave_config_eoe_dns_address(ec_slave_config_t *sc,
 int ecrt_slave_config_eoe_hostname(ec_slave_config_t *sc,
         const char *name)
 {
-    strncpy(sc->eoe_ip_param_request.name, name, EC_MAX_HOSTNAME_SIZE);
+    strncpy(sc->eoe_ip_param_request.name, name, EC_MAX_HOSTNAME_SIZE - 1);
     sc->eoe_ip_param_request.name_included = 1;
     return 0;
 }