diff --git a/internal/definitions/firewall/destination_nat.go b/internal/definitions/firewall/destination_nat.go
index dc2f09b..54cae2e 100644
--- a/internal/definitions/firewall/destination_nat.go
+++ b/internal/definitions/firewall/destination_nat.go
@@ -2,6 +2,6 @@ package firewall
 
 type DestinationNATRule struct {
 	Rule
-	Address string `json:"address,omitempty"`
-	Service string `json:"service,omitempty"`
+	Address *string `json:"address,omitempty"`
+	Service *string `json:"service,omitempty"`
 }
diff --git a/internal/definitions/firewall/source_nat.go b/internal/definitions/firewall/source_nat.go
index 49b06b0..239835a 100644
--- a/internal/definitions/firewall/source_nat.go
+++ b/internal/definitions/firewall/source_nat.go
@@ -5,8 +5,8 @@ import "encoding/json"
 type SourceNATRule struct {
 	Rule
 	Type    SnatType `json:"type" validate:"min=0,max=1"`
-	Address string   `json:"address,omitempty"`
-	Service string   `json:"service,omitempty"`
+	Address *string  `json:"address,omitempty"`
+	Service *string  `json:"service,omitempty"`
 }
 
 type SnatType int