diff --git a/libnetwork/drivers/overlay/ov_network.go b/libnetwork/drivers/overlay/ov_network.go
index f611d11d89..4c77ff620d 100644
--- a/libnetwork/drivers/overlay/ov_network.go
+++ b/libnetwork/drivers/overlay/ov_network.go
@@ -539,25 +539,23 @@ func checkOverlap(nw *net.IPNet) error {
 }
 
 func (n *network) restoreSubnetSandbox(s *subnet, brName, vxlanName string) error {
-	sbox := n.sbox
-
 	// restore overlay osl sandbox
-	Ifaces := make(map[string][]osl.IfaceOption)
-	brIfaceOption := make([]osl.IfaceOption, 2)
-	brIfaceOption = append(brIfaceOption, sbox.InterfaceOptions().Address(s.gwIP))
-	brIfaceOption = append(brIfaceOption, sbox.InterfaceOptions().Bridge(true))
-	Ifaces[brName+"+br"] = brIfaceOption
-
-	err := sbox.Restore(Ifaces, nil, nil, nil)
-	if err != nil {
+	ifaces := map[string][]osl.IfaceOption{
+		brName + "+br": {
+			n.sbox.InterfaceOptions().Address(s.gwIP),
+			n.sbox.InterfaceOptions().Bridge(true),
+		},
+	}
+	if err := n.sbox.Restore(ifaces, nil, nil, nil); err != nil {
 		return err
 	}
 
-	Ifaces = make(map[string][]osl.IfaceOption)
-	vxlanIfaceOption := make([]osl.IfaceOption, 1)
-	vxlanIfaceOption = append(vxlanIfaceOption, sbox.InterfaceOptions().Master(brName))
-	Ifaces[vxlanName+"+vxlan"] = vxlanIfaceOption
-	return sbox.Restore(Ifaces, nil, nil, nil)
+	ifaces = map[string][]osl.IfaceOption{
+		vxlanName + "+vxlan": {
+			n.sbox.InterfaceOptions().Master(brName),
+		},
+	}
+	return n.sbox.Restore(ifaces, nil, nil, nil)
 }
 
 func (n *network) setupSubnetSandbox(s *subnet, brName, vxlanName string) error {
diff --git a/libnetwork/sandbox.go b/libnetwork/sandbox.go
index f7a6b20fcb..8b3db16843 100644
--- a/libnetwork/sandbox.go
+++ b/libnetwork/sandbox.go
@@ -795,7 +795,6 @@ func (sb *sandbox) restoreOslSandbox() error {
 	// restore osl sandbox
 	Ifaces := make(map[string][]osl.IfaceOption)
 	for _, ep := range sb.endpoints {
-		var ifaceOptions []osl.IfaceOption
 		ep.Lock()
 		joinInfo := ep.joinInfo
 		i := ep.iface
@@ -806,7 +805,10 @@ func (sb *sandbox) restoreOslSandbox() error {
 			continue
 		}
 
-		ifaceOptions = append(ifaceOptions, sb.osSbox.InterfaceOptions().Address(i.addr), sb.osSbox.InterfaceOptions().Routes(i.routes))
+		ifaceOptions := []osl.IfaceOption{
+			sb.osSbox.InterfaceOptions().Address(i.addr),
+			sb.osSbox.InterfaceOptions().Routes(i.routes),
+		}
 		if i.addrv6 != nil && i.addrv6.IP.To16() != nil {
 			ifaceOptions = append(ifaceOptions, sb.osSbox.InterfaceOptions().AddressIPv6(i.addrv6))
 		}
@@ -816,7 +818,7 @@ func (sb *sandbox) restoreOslSandbox() error {
 		if len(i.llAddrs) != 0 {
 			ifaceOptions = append(ifaceOptions, sb.osSbox.InterfaceOptions().LinkLocalAddresses(i.llAddrs))
 		}
-		Ifaces[fmt.Sprintf("%s+%s", i.srcName, i.dstPrefix)] = ifaceOptions
+		Ifaces[i.srcName+i.dstPrefix] = ifaceOptions
 		if joinInfo != nil {
 			routes = append(routes, joinInfo.StaticRoutes...)
 		}
@@ -831,8 +833,7 @@ func (sb *sandbox) restoreOslSandbox() error {
 	}
 
 	// restore osl sandbox
-	err := sb.osSbox.Restore(Ifaces, routes, gwep.joinInfo.gw, gwep.joinInfo.gw6)
-	return err
+	return sb.osSbox.Restore(Ifaces, routes, gwep.joinInfo.gw, gwep.joinInfo.gw6)
 }
 
 func (sb *sandbox) populateNetworkResources(ep *endpoint) error {