diff --git a/stacks-common/src/util/lru_cache.rs b/stacks-common/src/util/lru_cache.rs
index 41f55613e2..2f93911621 100644
--- a/stacks-common/src/util/lru_cache.rs
+++ b/stacks-common/src/util/lru_cache.rs
@@ -13,7 +13,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-use std::collections::HashMap;
+use hashbrown::HashMap;
 
 /// Node in the doubly linked list
 struct Node<K, V> {
diff --git a/stackslib/src/core/nonce_cache.rs b/stackslib/src/core/nonce_cache.rs
index 54c9acb563..80a8e3ffc7 100644
--- a/stackslib/src/core/nonce_cache.rs
+++ b/stackslib/src/core/nonce_cache.rs
@@ -219,7 +219,7 @@ mod tests {
         clarity_instance
             .begin_test_genesis_block(
                 &StacksBlockId::sentinel(),
-                &StacksBlockId([0 as u8; 32]),
+                &StacksBlockId([0u8; 32]),
                 &TEST_HEADER_DB,
                 &TEST_BURN_STATE_DB,
             )