diff --git a/src/mempool.rs b/src/mempool.rs
index 8924a74..0658936 100644
--- a/src/mempool.rs
+++ b/src/mempool.rs
@@ -1,8 +1,7 @@
 use bitcoin::blockdata::transaction::Transaction;
 use bitcoin::util::hash::Sha256dHash;
 use hex;
-use std::collections::BTreeMap;
-use std::collections::{HashMap, HashSet};
+use std::collections::{BTreeMap, HashMap, HashSet};
 use std::iter::FromIterator;
 use std::ops::Bound;
 use std::sync::{Mutex, RwLock};