diff --git a/miniz_oxide/src/deflate/buffer.rs b/miniz_oxide/src/deflate/buffer.rs
index f246c07..64a6f83 100644
--- a/miniz_oxide/src/deflate/buffer.rs
+++ b/miniz_oxide/src/deflate/buffer.rs
@@ -2,6 +2,10 @@
 //! to avoid stack copies. Box::new() doesn't at the moment, and using a vec means we would lose
 //! static length info.
 
+use alloc::boxed::Box;
+use alloc::vec;
+use core::convert::TryInto;
+
 use crate::deflate::core::{LZ_DICT_SIZE, MAX_MATCH_LEN};
 
 /// Size of the buffer of lz77 encoded data.
@@ -23,36 +27,41 @@ pub fn update_hash(current_hash: u16, byte: u8) -> u16 {
 }
 
 pub struct HashBuffers {
-    pub dict: [u8; LZ_DICT_FULL_SIZE],
-    pub next: [u16; LZ_DICT_SIZE],
-    pub hash: [u16; LZ_DICT_SIZE],
+    pub dict: Box<[u8; LZ_DICT_FULL_SIZE]>,
+    pub next: Box<[u16; LZ_DICT_SIZE]>,
+    pub hash: Box<[u16; LZ_DICT_SIZE]>,
 }
 
 impl HashBuffers {
     #[inline]
     pub fn reset(&mut self) {
-        *self = HashBuffers::default();
+        self.dict.fill(0);
+        self.next.fill(0);
+        self.hash.fill(0);
     }
 }
 
 impl Default for HashBuffers {
     fn default() -> HashBuffers {
         HashBuffers {
-            dict: [0; LZ_DICT_FULL_SIZE],
-            next: [0; LZ_DICT_SIZE],
-            hash: [0; LZ_DICT_SIZE],
+            dict: vec![0; LZ_DICT_FULL_SIZE]
+                .into_boxed_slice()
+                .try_into()
+                .unwrap(),
+            next: vec![0; LZ_DICT_SIZE].into_boxed_slice().try_into().unwrap(),
+            hash: vec![0; LZ_DICT_SIZE].into_boxed_slice().try_into().unwrap(),
         }
     }
 }
 
 pub struct LocalBuf {
-    pub b: [u8; OUT_BUF_SIZE],
+    pub b: Box<[u8; OUT_BUF_SIZE]>,
 }
 
 impl Default for LocalBuf {
     fn default() -> LocalBuf {
         LocalBuf {
-            b: [0; OUT_BUF_SIZE],
+            b: vec![0; OUT_BUF_SIZE].into_boxed_slice().try_into().unwrap(),
         }
     }
 }
diff --git a/miniz_oxide/src/deflate/core.rs b/miniz_oxide/src/deflate/core.rs
index b0a532d..a9d4e5e 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,
@@ -1401,7 +1401,7 @@ struct ParamsOxide {
     pub saved_bit_buffer: u32,
     pub saved_bits_in: u32,
 
-    pub local_buf: Box<LocalBuf>,
+    pub local_buf: LocalBuf,
 }
 
 impl ParamsOxide {
@@ -1423,7 +1423,7 @@ impl ParamsOxide {
             prev_return_status: TDEFLStatus::Okay,
             saved_bit_buffer: 0,
             saved_bits_in: 0,
-            local_buf: Box::default(),
+            local_buf: LocalBuf::default(),
         }
     }
 
@@ -1448,7 +1448,7 @@ impl ParamsOxide {
         self.prev_return_status = TDEFLStatus::Okay;
         self.saved_bit_buffer = 0;
         self.saved_bits_in = 0;
-        self.local_buf.b = [0; OUT_BUF_SIZE];
+        self.local_buf.b.fill(0);
     }
 }
 
@@ -1628,7 +1628,7 @@ fn flush_block(
     {
         let mut output = callback
             .out
-            .new_output_buffer(&mut d.params.local_buf.b, d.params.out_buf_ofs);
+            .new_output_buffer(d.params.local_buf.b.as_mut(), d.params.out_buf_ofs);
         output.bit_buffer = d.params.saved_bit_buffer;
         output.bits_in = d.params.saved_bits_in;