diff --git a/libnetwork/portallocator/portallocator.go b/libnetwork/portallocator/portallocator.go
index de96da8623..a4fd39919c 100644
--- a/libnetwork/portallocator/portallocator.go
+++ b/libnetwork/portallocator/portallocator.go
@@ -91,8 +91,8 @@ func Get() *PortAllocator {
 func newInstance() *PortAllocator {
 	start, end, err := getDynamicPortRange()
 	if err != nil {
-		logrus.WithError(err).Infof("falling back to default port range %d-%d", DefaultPortRangeStart, DefaultPortRangeEnd)
-		start, end = DefaultPortRangeStart, DefaultPortRangeEnd
+		logrus.WithError(err).Infof("falling back to default port range %d-%d", defaultPortRangeStart, defaultPortRangeEnd)
+		start, end = defaultPortRangeStart, defaultPortRangeEnd
 	}
 	return &PortAllocator{
 		ipMap: ipMapping{},
diff --git a/libnetwork/portallocator/portallocator_unix.go b/libnetwork/portallocator/portallocator_unix.go
index 80e590bf03..ac8e863de9 100644
--- a/libnetwork/portallocator/portallocator_unix.go
+++ b/libnetwork/portallocator/portallocator_unix.go
@@ -4,10 +4,10 @@
 package portallocator
 
 const (
-	// DefaultPortRangeStart indicates the first port in port range
-	DefaultPortRangeStart = 49153
-	// DefaultPortRangeEnd indicates the last port in port range
+	// defaultPortRangeStart indicates the first port in port range
+	defaultPortRangeStart = 49153
+	// defaultPortRangeEnd indicates the last port in port range
 	// consistent with default /proc/sys/net/ipv4/ip_local_port_range
 	// upper bound on linux
-	DefaultPortRangeEnd = 65535
+	defaultPortRangeEnd = 65535
 )
diff --git a/libnetwork/portallocator/portallocator_windows.go b/libnetwork/portallocator/portallocator_windows.go
index 160edea90b..07c4411eae 100644
--- a/libnetwork/portallocator/portallocator_windows.go
+++ b/libnetwork/portallocator/portallocator_windows.go
@@ -1,12 +1,12 @@
 package portallocator
 
 const (
-	// DefaultPortRangeStart indicates the first port in port range
-	DefaultPortRangeStart = 60000
-	// DefaultPortRangeEnd indicates the last port in port range
-	DefaultPortRangeEnd = 65000
+	// defaultPortRangeStart indicates the first port in port range
+	defaultPortRangeStart = 60000
+	// defaultPortRangeEnd indicates the last port in port range
+	defaultPortRangeEnd = 65000
 )
 
 func getDynamicPortRange() (start int, end int, err error) {
-	return DefaultPortRangeStart, DefaultPortRangeEnd, nil
+	return defaultPortRangeStart, defaultPortRangeEnd, nil
 }