diff --git a/chuniio/src/servers/ios.c b/chuniio/src/servers/ios.c
index 1b60b2d..4688efd 100644
--- a/chuniio/src/servers/ios.c
+++ b/chuniio/src/servers/ios.c
@@ -212,7 +212,7 @@ void device_event_callback(const idevice_event_t *event, void *user_data) {
         print_err("[iOS: INFO] iDevice added, udid: %s\n", event->udid);
 
         ios_thread_ctx *args = malloc(sizeof(ios_thread_ctx));
-        memcpy(args->remote_udid, event->udid, strlen(event->udid));
+        strcpy_s(args->remote_udid, 41, event->udid);
         args->device = NULL;
         args->connection = NULL;
         args->exit_flag = ATOMIC_VAR_INIT(false);