diff --git a/src/pmdas/postgresql/pmdapostgresql.pl b/src/pmdas/postgresql/pmdapostgresql.pl
index e97252e..29c7593 100644
--- a/src/pmdas/postgresql/pmdapostgresql.pl
+++ b/src/pmdas/postgresql/pmdapostgresql.pl
@@ -18,8 +18,9 @@ use PCP::PMDA;
 use DBI;
 
 my $database = 'dbi:Pg:dbname=postgres';
-my $username = 'postgres';
-my $password = '';	# DBI parameter, typically unused for postgres
+my $username = 'postgres';	# DB username for DB login
+my $password = '';		# DBI parameter, typically unused for postgres
+my $os_user = 'postgres';	# O/S user to run the PMDA
 
 # Configuration files for overriding the above settings
 for my $file (	'/etc/pcpdbi.conf',	# system defaults (lowest priority)
@@ -249,6 +250,7 @@ sub postgresql_version_query
 sub postgresql_connection_setup
 {
     if (!defined($dbh)) {
+	$pmda->log("connect to DB $database as user $username");
 	$dbh = DBI->connect($database, $username, $password,
 			    {AutoCommit => 1, pg_bool_tf => 0});
 	if (defined($dbh)) {
@@ -1463,5 +1465,6 @@ postgresql_indoms_setup();
 $pmda->set_fetch_callback(\&postgresql_fetch_callback);
 $pmda->set_fetch(\&postgresql_connection_setup);
 $pmda->set_refresh(\&postgresql_refresh);
-$pmda->set_user('postgres');
+$pmda->log("Change to UID to user $os_user");
+$pmda->set_user($os_user);
 $pmda->run;