diff --git a/include/sys/syscall_lookup.h b/include/sys/syscall_lookup.h
index d51d43c422cf1..9d7f9c3c8de55 100644
--- a/include/sys/syscall_lookup.h
+++ b/include/sys/syscall_lookup.h
@@ -270,6 +270,10 @@ SYSCALL_LOOKUP(futimens,                   2)
   SYSCALL_LOOKUP(nx_mkfifo,                3)
 #endif
 
+#ifndef CONFIG_BUILD_FLAT
+  SYSCALL_LOOKUP(nxtask_exit_cleanup,      1)
+#endif
+
 #ifdef CONFIG_FILE_STREAM
   SYSCALL_LOOKUP(fs_fdopen,                4)
   SYSCALL_LOOKUP(nxsched_get_streams,      0)
diff --git a/syscall/syscall.csv b/syscall/syscall.csv
index 0f2115f32af2a..b9a280219e6c9 100644
--- a/syscall/syscall.csv
+++ b/syscall/syscall.csv
@@ -76,6 +76,7 @@
 "nx_vsyslog","nuttx/syslog/syslog.h","","int","int","FAR const IPTR char *","FAR va_list *"
 "nxsched_get_stackinfo","nuttx/sched.h","","int","pid_t","FAR struct stackinfo_s *"
 "nxsched_get_streams","nuttx/sched.h","defined(CONFIG_FILE_STREAM)","FAR struct streamlist *"
+"nxtask_exit_cleanup","nuttx/sched.h","","void","int"
 "open","fcntl.h","","int","FAR const char *","int","...","mode_t"
 "opendir","dirent.h","","FAR DIR *","FAR const char *"
 "pgalloc", "nuttx/arch.h", "defined(CONFIG_BUILD_KERNEL)", "uintptr_t", "uintptr_t", "unsigned int"