diff --git a/clarity/src/vm/costs/mod.rs b/clarity/src/vm/costs/mod.rs
index ee9a1a6eb2..c70ab9600a 100644
--- a/clarity/src/vm/costs/mod.rs
+++ b/clarity/src/vm/costs/mod.rs
@@ -18,7 +18,6 @@ use std::collections::{BTreeMap, HashMap};
 use std::convert::{TryFrom, TryInto};
 use std::{cmp, fmt};
 
-use regex::internal::Exec;
 use rusqlite::types::{FromSql, FromSqlResult, ToSql, ToSqlOutput, ValueRef};
 use serde::{Deserialize, Serialize};