diff --git a/hcloud/schema/firewall.go b/hcloud/schema/firewall.go
index 371e648f1..db0463227 100644
--- a/hcloud/schema/firewall.go
+++ b/hcloud/schema/firewall.go
@@ -16,7 +16,7 @@ type Firewall struct {
 type FirewallRule struct {
 	Direction      string   `json:"direction"`
 	SourceIPs      []string `json:"source_ips,omitempty"`
-	DestinationIPs []string `json:"destination_ips,omitempty"`
+	DestinationIPs []string `json:"destination_ips"`
 	Protocol       string   `json:"protocol"`
 	Port           *string  `json:"port,omitempty"`
 	Description    *string  `json:"description,omitempty"`