diff --git a/cmd/postgres_exporter/postgres_exporter.go b/cmd/postgres_exporter/postgres_exporter.go
index 06fb0146..3d890a16 100644
--- a/cmd/postgres_exporter/postgres_exporter.go
+++ b/cmd/postgres_exporter/postgres_exporter.go
@@ -258,13 +258,13 @@ var builtinMetricMaps = map[string]intermediateMetricMap{
 	},
 	"pg_stat_activity": {
 		map[string]ColumnMapping{
-			"datname":             {LABEL, "Name of this database", nil, nil},
-			"state":               {LABEL, "connection state", nil, semver.MustParseRange(">=9.2.0")},
-			"usename":             {LABEL, "Name of the user logged into this backend", nil, nil},
-			"application_name":    {LABEL, "Name of the application that is connected to this backend", nil, nil},
-			"count":               {GAUGE, "number of connections in this state", nil, nil},
-			"max_tx_duration":     {GAUGE, "max duration in seconds any active transaction has been running", nil, nil},
-			"max_state_duration":  {GAUGE, "max state change duration in seconds any active transaction has been", nil, nil},
+			"datname":            {LABEL, "Name of this database", nil, nil},
+			"state":              {LABEL, "connection state", nil, semver.MustParseRange(">=9.2.0")},
+			"usename":            {LABEL, "Name of the user logged into this backend", nil, nil},
+			"application_name":   {LABEL, "Name of the application that is connected to this backend", nil, nil},
+			"count":              {GAUGE, "number of connections in this state", nil, nil},
+			"max_tx_duration":    {GAUGE, "max duration in seconds any active transaction has been running", nil, nil},
+			"max_state_duration": {GAUGE, "max state change duration in seconds any active transaction has been", nil, nil},
 		},
 		true,
 		0,