diff --git a/miniz_oxide/src/deflate/buffer.rs b/miniz_oxide/src/deflate/buffer.rs
index f246c07..e8b6b01 100644
--- a/miniz_oxide/src/deflate/buffer.rs
+++ b/miniz_oxide/src/deflate/buffer.rs
@@ -2,6 +2,8 @@
 //! to avoid stack copies. Box::new() doesn't at the moment, and using a vec means we would lose
 //! static length info.
 
+use alloc::vec::Vec;
+
 use crate::deflate::core::{LZ_DICT_SIZE, MAX_MATCH_LEN};
 
 /// Size of the buffer of lz77 encoded data.
@@ -22,26 +24,19 @@ pub fn update_hash(current_hash: u16, byte: u8) -> u16 {
     ((current_hash << LZ_HASH_SHIFT) ^ u16::from(byte)) & (LZ_HASH_SIZE as u16 - 1)
 }
 
+#[derive(Default)]
 pub struct HashBuffers {
-    pub dict: [u8; LZ_DICT_FULL_SIZE],
-    pub next: [u16; LZ_DICT_SIZE],
-    pub hash: [u16; LZ_DICT_SIZE],
+    pub dict: Vec<u8>,
+    pub next: Vec<u16>,
+    pub hash: Vec<u16>,
 }
 
 impl HashBuffers {
     #[inline]
     pub fn reset(&mut self) {
-        *self = HashBuffers::default();
-    }
-}
-
-impl Default for HashBuffers {
-    fn default() -> HashBuffers {
-        HashBuffers {
-            dict: [0; LZ_DICT_FULL_SIZE],
-            next: [0; LZ_DICT_SIZE],
-            hash: [0; LZ_DICT_SIZE],
-        }
+        self.dict.fill(0);
+        self.next.fill(0);
+        self.hash.fill(0);
     }
 }
 
diff --git a/miniz_oxide/src/deflate/core.rs b/miniz_oxide/src/deflate/core.rs
index b0a532d..79cdeb4 100644
--- a/miniz_oxide/src/deflate/core.rs
+++ b/miniz_oxide/src/deflate/core.rs
@@ -1195,7 +1195,7 @@ struct DictOxide {
     pub max_probes: [u32; 2],
     /// Buffer of input data.
     /// Padded with 1 byte to simplify matching code in `compress_fast`.
-    pub b: Box<HashBuffers>,
+    pub b: HashBuffers,
 
     pub code_buf_dict_pos: usize,
     pub lookahead_size: usize,
@@ -1214,7 +1214,7 @@ impl DictOxide {
     fn new(flags: u32) -> Self {
         DictOxide {
             max_probes: probes_from_flags(flags),
-            b: Box::default(),
+            b: HashBuffers::default(),
             code_buf_dict_pos: 0,
             lookahead_size: 0,
             lookahead_pos: 0,