diff --git a/files.c b/files.c
index 65b3dea76..5be2c8547 100644
--- a/files.c
+++ b/files.c
@@ -405,7 +405,7 @@ int prepare_ctl_tty(int pid, struct rst_info *rst_info, u32 ctl_tty_id)
 	fdinfo_entry__init(e);
 
 	e->id		= ctl_tty_id;
-	e->fd		= get_service_fd(CTL_TTY_OFF);
+	e->fd		= reserve_service_fd(CTL_TTY_OFF);
 	e->type		= FD_TYPES__TTY;
 
 	if (collect_fd(pid, e, rst_info)) {
diff --git a/include/crtools.h b/include/crtools.h
index ee90839d7..65eb15438 100644
--- a/include/crtools.h
+++ b/include/crtools.h
@@ -132,6 +132,7 @@ enum sfd_type {
 extern int clone_service_fd(int id);
 extern int init_service_fd(void);
 extern int get_service_fd(enum sfd_type type);
+extern int reserve_service_fd(enum sfd_type type);
 extern int install_service_fd(enum sfd_type type, int fd);
 extern int close_service_fd(enum sfd_type type);
 extern bool is_service_fd(int fd, enum sfd_type type);
diff --git a/util.c b/util.c
index 2b2596e59..5109a5736 100644
--- a/util.c
+++ b/util.c
@@ -296,6 +296,16 @@ static int __get_service_fd(enum sfd_type type, int service_fd_id)
 
 static DECLARE_BITMAP(sfd_map, SERVICE_FD_MAX);
 
+int reserve_service_fd(enum sfd_type type)
+{
+	int sfd = __get_service_fd(type, service_fd_id);
+
+	BUG_ON((int)type <= SERVICE_FD_MIN || (int)type >= SERVICE_FD_MAX);
+
+	set_bit(type, sfd_map);
+	return sfd;
+}
+
 int install_service_fd(enum sfd_type type, int fd)
 {
 	int sfd = __get_service_fd(type, service_fd_id);