diff --git a/internal/configuration/settings/firewall.go b/internal/configuration/settings/firewall.go
index d0edbf4d..b8a907dc 100644
--- a/internal/configuration/settings/firewall.go
+++ b/internal/configuration/settings/firewall.go
@@ -109,7 +109,8 @@ func (f Firewall) toLinesNode() (node *gotree.Node) {
 	if len(f.OutboundSubnets) > 0 {
 		outboundSubnets := node.Appendf("Outbound subnets:")
 		for _, subnet := range f.OutboundSubnets {
-			outboundSubnets.Appendf("%s", subnet)
+			subnet := subnet
+			outboundSubnets.Appendf("%s", &subnet)
 		}
 	}