diff --git a/packages/clients/src/api/instance/v1/marshalling.gen.ts b/packages/clients/src/api/instance/v1/marshalling.gen.ts
index 8a0024511..505572dbf 100644
--- a/packages/clients/src/api/instance/v1/marshalling.gen.ts
+++ b/packages/clients/src/api/instance/v1/marshalling.gen.ts
@@ -351,7 +351,7 @@ const unmarshalServerMaintenance = (data: unknown) => {
     )
   }
 
-  return {} as ServerMaintenance
+  return { reason: data.reason } as ServerMaintenance
 }
 
 const unmarshalServerTypeCapabilities = (data: unknown) => {
@@ -1542,7 +1542,9 @@ const marshalServerLocation = (
 const marshalServerMaintenance = (
   request: ServerMaintenance,
   defaults: DefaultValues,
-): Record<string, unknown> => ({})
+): Record<string, unknown> => ({
+  reason: request.reason,
+})
 
 const marshalSetSecurityGroupRulesRequestRule = (
   request: SetSecurityGroupRulesRequestRule,
diff --git a/packages/clients/src/api/instance/v1/types.gen.ts b/packages/clients/src/api/instance/v1/types.gen.ts
index 83b3ee45c..3f088046a 100644
--- a/packages/clients/src/api/instance/v1/types.gen.ts
+++ b/packages/clients/src/api/instance/v1/types.gen.ts
@@ -579,7 +579,9 @@ export interface ServerLocation {
   zoneId: string
 }
 
-export interface ServerMaintenance {}
+export interface ServerMaintenance {
+  reason: string
+}
 
 export interface ServerSummary {
   id: string