diff --git a/client/src/Types/Monitor.ts b/client/src/Types/Monitor.ts
index 1e3dafb99..b2d90cb0b 100644
--- a/client/src/Types/Monitor.ts
+++ b/client/src/Types/Monitor.ts
@@ -71,6 +71,7 @@ export interface Monitor {
 	uptimePercentage?: number;
 	notifications: string[];
 	tags: string[];
+	customUpCodes?: number[];
 	secret?: string;
 	cpuAlertThreshold: number;
 	cpuAlertCounter: number;
diff --git a/client/src/Validation/monitor.ts b/client/src/Validation/monitor.ts
index 80d0d77c4..a6006d543 100644
--- a/client/src/Validation/monitor.ts
+++ b/client/src/Validation/monitor.ts
@@ -64,6 +64,10 @@ const httpSchema = baseSchema.extend({
 		.register(monitorStepRegistry, { step: 2 }),
 	expectedValue: z.string().optional().register(monitorStepRegistry, { step: 2 }),
 	jsonPath: z.string().optional().register(monitorStepRegistry, { step: 2 }),
+	customUpCodes: z
+		.array(z.number().min(100).max(599))
+		.optional()
+		.register(monitorStepRegistry, { step: 2 }),
 	...geoCheckFields,
 });