diff --git a/server/src/dtos/system-config.dto.ts b/server/src/dtos/system-config.dto.ts
index 98acb495ce..e2255223d0 100644
--- a/server/src/dtos/system-config.dto.ts
+++ b/server/src/dtos/system-config.dto.ts
@@ -376,7 +376,8 @@ class SystemConfigReverseGeocodingDto {
 }
 
 class SystemConfigServerDto {
-  @IsString()
+  @ValidateIf((_, value: string) => value !== '')
+  @IsUrl({ require_tld: false, require_protocol: true, protocols: ['http', 'https'] })
   externalDomain!: string;
 
   @IsString()