diff --git a/nshlib/nsh_builtin.c b/nshlib/nsh_builtin.c
index c7a1768d9..57fa8c8ea 100644
--- a/nshlib/nsh_builtin.c
+++ b/nshlib/nsh_builtin.c
@@ -160,7 +160,7 @@ int nsh_builtin(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
            * waitpid() to return with ECHILD.
            */
 
-          ret = waitpid(pid, &rc, WUNTRACED);
+          ret = waitpid(ret, &rc, WUNTRACED);
           if (ret < 0)
             {
               /* If the child thread does not exist, waitpid() will return