diff --git a/libnetwork/portallocator/portallocator.go b/libnetwork/portallocator/portallocator.go
index b2877d5c41..e5adb709fc 100644
--- a/libnetwork/portallocator/portallocator.go
+++ b/libnetwork/portallocator/portallocator.go
@@ -9,15 +9,6 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-var (
-	// 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 = 60999
-)
-
 func sanitizePortRange(start int, end int) (newStart, newEnd int, err error) {
 	if start > defaultPortRangeEnd || end < defaultPortRangeStart || start > end {
 		return 0, 0, fmt.Errorf("Request out allowed range [%v, %v]",
diff --git a/libnetwork/portallocator/portallocator_unix.go b/libnetwork/portallocator/portallocator_unix.go
new file mode 100644
index 0000000000..a1db634aea
--- /dev/null
+++ b/libnetwork/portallocator/portallocator_unix.go
@@ -0,0 +1,12 @@
+// +build !windows
+
+package portallocator
+
+const (
+	// 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 = 60999
+)
diff --git a/libnetwork/portallocator/portallocator_windows.go b/libnetwork/portallocator/portallocator_windows.go
index 7d0d5c8037..07c4411eae 100644
--- a/libnetwork/portallocator/portallocator_windows.go
+++ b/libnetwork/portallocator/portallocator_windows.go
@@ -1,9 +1,11 @@
 package portallocator
 
-func init() {
+const (
+	// 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