1 files changed, 1 insertions, 1 deletions

diff --git a/regress/yes-head.sh b/regress/yes-head.sh
index 17a4d0dd4..a8e6bc800 100644
--- a/regress/yes-head.sh
+++ b/regress/yes-head.sh
@@ -4,7 +4,7 @@
 tid="yes pipe head"
 
 for p in 1 2; do
-        lines=`${SSH} -$p -F $OBJ/ssh_proxy thishost 'sh -c "while true;do echo yes;done | head -2000"' | (sleep 3 ; wc -l)`
+        lines=`${SSH} -$p -F $OBJ/ssh_proxy thishost 'sh -c "while true;do echo yes;done | _POSIX2_VERSION=199209 head -2000"' | (sleep 3 ; wc -l)`
         if [ $? -ne 0 ]; then
                 fail "yes|head test failed"
                 lines = 0;