diff --git a/installer.cfg b/installer.cfg
index 462b490..0b181d6 100644
--- a/installer.cfg
+++ b/installer.cfg
@@ -4,8 +4,8 @@ tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
 
 [database]
 # Select database engine : postgres or mysql
-#engine = postgres
-engine = mysql
+engine = postgres
+#engine = mysql
 host = 127.0.0.1
 install = true
 
diff --git a/modoboa_installer/database.py b/modoboa_installer/database.py
index eddc7b3..f325617 100644
--- a/modoboa_installer/database.py
+++ b/modoboa_installer/database.py
@@ -45,6 +45,7 @@ class PostgreSQL(Database):
         """Exec a postgresql query."""
         cmd = "psql"
         if dbname and dbuser:
+            self._setup_pgpass(dbname, dbuser, dbpassword)
             cmd += " -h {} -d {} -U {} -w".format(self.dbhost, dbname, dbuser)
         utils.exec_cmd(
             """{} -c "{}" """.format(cmd, query), sudo_user=self.dbuser)