diff --git a/regress/percent.sh b/regress/percent.sh
index a09f16124..566700ea4 100644
--- a/regress/percent.sh
+++ b/regress/percent.sh
@@ -3,6 +3,11 @@
 
 tid="percent expansions"
 
+if [ -x "/usr/xpg4/bin/id" ]; then
+	PATH=/usr/xpg4/bin:$PATH
+	export PATH
+fi
+
 USER=`id -u -n`
 USERID=`id -u`
 HOST=`hostname | cut -f1 -d.`