diff --git a/crates/fidc-core/src/portfolio.rs b/crates/fidc-core/src/portfolio.rs
index 9f851f0..6c786c1 100644
--- a/crates/fidc-core/src/portfolio.rs
+++ b/crates/fidc-core/src/portfolio.rs
@@ -1438,8 +1438,6 @@ mod tests {
         BenchmarkSnapshot, CandidateEligibility, DailyFactorSnapshot, DailyMarketSnapshot, DataSet,
         PriceField,
     };
-    use std::collections::BTreeMap;
-
     #[test]
     fn cash_ledger_accumulates_micro_yuan_exactly() {
         let mut portfolio = PortfolioState::new(1_000_000.0);