diff --git a/server/adminserver/api/v1/system/activecode.go b/server/adminserver/api/v1/system/activecode.go
index bef693aa..e05ae7b0 100644
--- a/server/adminserver/api/v1/system/activecode.go
+++ b/server/adminserver/api/v1/system/activecode.go
@@ -90,7 +90,7 @@ func (aca *ActiveCodeApi) GenCode(c *gin.Context) {
 	})
 }
 
-const strpol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz"
+const strpol = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789abcdefghjkmnpqrstuvwxyz"
 
 func (this *ActiveCodeApi) genCode(n int) string {
 	var sb strings.Builder