diff --git a/postgresql/pre-install b/postgresql/pre-install
index 01bd0056a..fbb932a69 100755
--- a/postgresql/pre-install
+++ b/postgresql/pre-install
@@ -4,6 +4,6 @@ _USER=postgres
 _HOME=/var/pgsql/data
 _GROUP=postgres
 
-getent group $_GROUP > /dev/null 2>&1 || groupadd $_GROUP
-getent passwd $_USER > /dev/null 2>&1 || useradd -c 'postgres system user' -g $_GROUP -d $_HOME -s /bin/false $_USER
+/usr/bin/getent group $_GROUP > /dev/null 2>&1 || /usr/sbin/groupadd $_GROUP
+/usr/bin/getent passwd $_USER > /dev/null 2>&1 || /usr/sbin/useradd -c 'postgres system user' -g $_GROUP -d $_HOME -s /bin/false $_USER
 passwd -l $_USER > /dev/null