diff --git a/plugins/postgresql/postgresql_transactions b/plugins/postgresql/postgresql_transactions
index e21708ab7..82e016197 100755
--- a/plugins/postgresql/postgresql_transactions
+++ b/plugins/postgresql/postgresql_transactions
@@ -21,8 +21,8 @@
 # Log info:
 #
 
-dbserver='localhost'
-dbuser='postgres'
+dbhost=${dbhost:-localhost}
+dbuser=${dbuser:-postgres}
 
 
 do_config() {
@@ -45,7 +45,7 @@ do_config() {
 
 
 do_fetch() {
-   psql -h "$dbserver" -U "$dbuser" -tc "SELECT 'commits.value '||SUM(xact_commit)::TEXT||E'\\nrollbacks.value '||SUM(xact_rollback)::TEXT FROM pg_stat_database;" --no-align
+   psql -h "$dbhost" -U "$dbuser" -tc "SELECT 'commits.value '||SUM(xact_commit)::TEXT||E'\\nrollbacks.value '||SUM(xact_rollback)::TEXT FROM pg_stat_database;" --no-align
 }