diff --git a/src/backend/NetAdmin/NetAdmin.SysComponent.Application/Services/Sys/CaptchaService.cs b/src/backend/NetAdmin/NetAdmin.SysComponent.Application/Services/Sys/CaptchaService.cs
index 760b1509..e5b2f8fb 100644
--- a/src/backend/NetAdmin/NetAdmin.SysComponent.Application/Services/Sys/CaptchaService.cs
+++ b/src/backend/NetAdmin/NetAdmin.SysComponent.Application/Services/Sys/CaptchaService.cs
@@ -2,6 +2,9 @@ using NetAdmin.Domain.Dto.Sys.Captcha;
 using Yitter.IdGenerator;
 #if WINDOWS
 using Size = SixLabors.ImageSharp.Size;
+
+#else
+using SixLabors.ImageSharp;
 #endif
 
 namespace NetAdmin.SysComponent.Application.Services.Sys;