diff --git a/prometheus/collectors/dbstats_collector.go b/prometheus/collectors/dbstats_collector.go
index e09f149d7..d5a7279fb 100644
--- a/prometheus/collectors/dbstats_collector.go
+++ b/prometheus/collectors/dbstats_collector.go
@@ -101,7 +101,7 @@ func (c *dbStatsCollector) Describe(ch chan<- *prometheus.Desc) {
 	ch <- c.waitDuration
 	ch <- c.maxIdleClosed
 	ch <- c.maxLifetimeClosed
-	c.describeNewInGo115(ch)
+	ch <- c.maxIdleTimeClosed
 }
 
 // Collect implements Collector.
@@ -115,5 +115,5 @@ func (c *dbStatsCollector) Collect(ch chan<- prometheus.Metric) {
 	ch <- prometheus.MustNewConstMetric(c.waitDuration, prometheus.CounterValue, stats.WaitDuration.Seconds())
 	ch <- prometheus.MustNewConstMetric(c.maxIdleClosed, prometheus.CounterValue, float64(stats.MaxIdleClosed))
 	ch <- prometheus.MustNewConstMetric(c.maxLifetimeClosed, prometheus.CounterValue, float64(stats.MaxLifetimeClosed))
-	c.collectNewInGo115(ch, stats)
+	ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
 }
diff --git a/prometheus/collectors/dbstats_collector_go115.go b/prometheus/collectors/dbstats_collector_go115.go
deleted file mode 100644
index 6d152fbf1..000000000
--- a/prometheus/collectors/dbstats_collector_go115.go
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright 2021 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build go1.15
-// +build go1.15
-
-package collectors
-
-import (
-	"database/sql"
-
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-func (c *dbStatsCollector) describeNewInGo115(ch chan<- *prometheus.Desc) {
-	ch <- c.maxIdleTimeClosed
-}
-
-func (c *dbStatsCollector) collectNewInGo115(ch chan<- prometheus.Metric, stats sql.DBStats) {
-	ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
-}
diff --git a/prometheus/collectors/dbstats_collector_pre_go115.go b/prometheus/collectors/dbstats_collector_pre_go115.go
deleted file mode 100644
index 65235069d..000000000
--- a/prometheus/collectors/dbstats_collector_pre_go115.go
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 2021 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build !go1.15
-// +build !go1.15
-
-package collectors
-
-import (
-	"database/sql"
-
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-func (c *dbStatsCollector) describeNewInGo115(ch chan<- *prometheus.Desc) {}
-
-func (c *dbStatsCollector) collectNewInGo115(ch chan<- prometheus.Metric, stats sql.DBStats) {}