diff --git a/src/cmd/ksh93/sh/xec.c b/src/cmd/ksh93/sh/xec.c

--- a/src/cmd/ksh93/sh/xec.c

+++ b/src/cmd/ksh93/sh/xec.c

@@ -122,6 +122,7 @@ int iousepipe(Shell_t *shp)

 		return(1);

 	}

 	subpipe[2] = sh_fcntl(fd,F_dupfd_cloexec,10);

+ 	sh_iovalidfd(shp,subpipe[2]);

 	shp->fdstatus[subpipe[2]] = shp->fdstatus[1];

 	while(close(fd)<0 && errno==EINTR)

 		errno = err;