diff --git a/wrenchboard/src/shared_tool/payments.cc b/wrenchboard/src/shared_tool/payments.cc
index 2900cb1e..e074c226 100644
--- a/wrenchboard/src/shared_tool/payments.cc
+++ b/wrenchboard/src/shared_tool/payments.cc
@@ -266,7 +266,7 @@ long  WrenchStartPayment( CVars in, CVars &out ){
     try {
             long member_id = REQ_LONG( in, "member_id", 1, -1 );
             long amount = REQ_LONG( in, "amount", 1, -1 );
-            REQ_STRING (in, "currency",   4, 15, "(.*)");
+            REQ_STRING (in, "currency",   2, 10, "(.*)");
             REQ_STRING(in, "uid", 3, 150, "(.*)");
             const PGresult *res = pgsql_query("SELECT uid,id AS member_id FROM members WHERE id=%lu AND uid='%s'", member_id, in["uid"].c_str());
             if (res != NULL && pgsql_num_rows(res) > 0) {