diff --git a/wrenchboard/src/shared_tool/account.cc b/wrenchboard/src/shared_tool/account.cc
index d91544c2..abe5f69e 100644
--- a/wrenchboard/src/shared_tool/account.cc
+++ b/wrenchboard/src/shared_tool/account.cc
@@ -540,10 +540,10 @@ long WrenchLoadReferLink(CVars in, CVars &out) {
 			long action_path    = REQ_LONG(in, "action_path", 1, -1);
 
 			if (action_path ==  200){
-               sprintf(buf, "SELECT firstname, lastname, email  FROM promo_member WHERE uid::text='%s' AND status = 1", in["refer_link"].c_str());
+               sprintf(buf, "SELECT firstname, lastname, email  FROM promo_member WHERE LOWER((uid::text)=LOWER('%s') AND status = 1", in["refer_link"].c_str());
 			}
 			else{
-               sprintf(buf, "SELECT firstname, lastname, email  FROM members_refer_friend WHERE refer_link='%s' AND status = 1", in["refer_link"].c_str());
+               sprintf(buf, "SELECT firstname, lastname, email  FROM members_refer_friend WHERE LOWER(refer_link)=LOWER('%s') AND status = 1", in["refer_link"].c_str());
 			}
 
 			if ( load_db_record(out, "%s ",  buf) > 0){