diff --git a/src/lib.rs b/src/lib.rs
index 835f37a..b011330 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,9 +19,6 @@ use hasher::BitBuildHasher;
 
 const BITS: u64 = 64;
 
-type Block = u64;
-type Storage = HashMap<u64, Block, BitBuildHasher>;
-
 pub type BitHashMap<V> = HashMap<u64, V, BitBuildHasher>;
 
 #[inline]
@@ -31,7 +28,7 @@ fn block_bit(x: u64, d: u64) -> (u64, u64) {
 
 #[derive(PartialEq, Eq, Clone)]
 pub struct BitSet {
-    blocks: Storage,
+    blocks: HashMap<u64, u64, BitBuildHasher>,
     nbits: usize,
 }
 
@@ -39,7 +36,7 @@ impl BitSet {
     #[inline]
     pub fn new() -> BitSet {
         BitSet {
-            blocks: Storage::default(),
+            blocks: HashMap::default(),
             nbits: 0,
         }
     }
@@ -47,7 +44,7 @@ impl BitSet {
     #[inline]
     pub fn with_capacity(capacity: usize) -> BitSet {
         BitSet {
-            blocks: Storage::with_capacity_and_hasher(capacity / BITS as usize, Default::default()),
+            blocks: HashMap::with_capacity_and_hasher(capacity / BITS as usize, Default::default()),
             nbits: 0,
         }
     }