diff --git a/src/cmd/ksh93/tests/jobs.sh b/src/cmd/ksh93/tests/jobs.sh
index fbac33cd5..e2e6e9398 100755
--- a/src/cmd/ksh93/tests/jobs.sh
+++ b/src/cmd/ksh93/tests/jobs.sh
@@ -20,7 +20,7 @@ function err_exit
 	let Errors++
 }
 alias err_exit='err_exit $LINENO'
-alias warning='err\_exit $((Errors--,LINENO))'
+alias warning='err\_exit $((Errors--,LINENO)) warning:'
 
 Command=${0##*/}
 integer Errors=0
@@ -79,7 +79,7 @@ kill %+ >out 2>&1 || err_exit "'kill %+' not working in script (got $(printf %q
 # =====
 # Before 2021-02-11, job control was deactivated in subshells
 # https://www.mail-archive.com/austin-group-l@opengroup.org/msg06456.html
-(sleep 1 & UNIX95=1 ps -o pid=,pgid= -p $!) | IFS=$' \t' read -r pid pgid
+(sleep 1 & UNIX95=1 command -p ps -o pid=,pgid= -p $! 2>/dev/null) | IFS=$' \t' read -r pid pgid
 if	let "pid>0 && pgid>0" 2>/dev/null
 then	kill $pid
 	let "pgid == pid" || err_exit "background job run in subshell didn't get its own process group ($pgid != $pid)"