diff --git a/libraries/chain/vesting_balance_evaluator.cpp b/libraries/chain/vesting_balance_evaluator.cpp
index 48bc8492..41780db9 100644
--- a/libraries/chain/vesting_balance_evaluator.cpp
+++ b/libraries/chain/vesting_balance_evaluator.cpp
@@ -100,7 +100,7 @@ void_result vesting_balance_withdraw_evaluator::do_evaluate( const vesting_balan
 
    const vesting_balance_object& vbo = op.vesting_balance( d );
    FC_ASSERT( op.owner == vbo.owner );
-   FC_ASSERT( vbo.is_withdraw_allowed( now, op.amount ) );
+   FC_ASSERT( vbo.is_withdraw_allowed( now, op.amount ), "", ("now", now)("op", op)("vbo", vbo) );
    assert( op.amount <= vbo.balance );      // is_withdraw_allowed should fail before this check is reached
 
    /* const account_object& owner_account = */ op.owner( d );