diff --git a/data/issue331_1.json.xz b/data/issue331_1.json.xz
new file mode 100644
index 00000000..c61ee5fe
Binary files /dev/null and b/data/issue331_1.json.xz differ
diff --git a/data/issue331_2.json.xz b/data/issue331_2.json.xz
new file mode 100644
index 00000000..ad742f03
Binary files /dev/null and b/data/issue331_2.json.xz differ
diff --git a/src/serialize/json.rs b/src/serialize/json.rs
index c8c806e0..9308d757 100644
--- a/src/serialize/json.rs
+++ b/src/serialize/json.rs
@@ -1,62 +1,11 @@
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 // This is an adaptation of `src/value/ser.rs` from serde-json.
 
+use crate::serialize::writer::WriteExt;
 use serde::ser::{self, Impossible, Serialize};
 use serde_json::error::{Error, Result};
 use std::io;
 
-#[allow(missing_docs)]
-// hack based on saethlin's research and patch in https://github.com/serde-rs/json/issues/766
-pub trait WriteExt: io::Write {
-    #[inline]
-    fn as_mut_buffer_ptr(&mut self) -> *mut u8 {
-        std::ptr::null_mut()
-    }
-
-    #[inline]
-    fn reserve(&mut self, len: usize) {
-        let _ = len;
-    }
-
-    #[inline]
-    fn set_written(&mut self, len: usize) {
-        let _ = len;
-    }
-
-    #[inline]
-    fn write_str(&mut self, val: &str) -> std::result::Result<(), std::io::Error> {
-        let _ = val;
-        Ok(())
-    }
-
-    #[inline]
-    unsafe fn write_reserved_fragment(
-        &mut self,
-        val: &[u8],
-    ) -> std::result::Result<(), std::io::Error> {
-        let _ = val;
-        Ok(())
-    }
-
-    #[inline]
-    unsafe fn write_reserved_punctuation(
-        &mut self,
-        val: u8,
-    ) -> std::result::Result<(), std::io::Error> {
-        let _ = val;
-        Ok(())
-    }
-
-    #[inline]
-    unsafe fn write_reserved_indent(
-        &mut self,
-        len: usize,
-    ) -> std::result::Result<(), std::io::Error> {
-        let _ = len;
-        Ok(())
-    }
-}
-
 pub struct Serializer<W, F = CompactFormatter> {
     writer: W,
     formatter: F,
diff --git a/src/serialize/mod.rs b/src/serialize/mod.rs
index 268e5627..9bb4d93c 100644
--- a/src/serialize/mod.rs
+++ b/src/serialize/mod.rs
@@ -9,7 +9,6 @@ mod dict;
 mod error;
 mod float;
 mod int;
-mod json;
 mod list;
 mod numpy;
 mod pyenum;
@@ -19,4 +18,7 @@ mod tuple;
 mod uuid;
 mod writer;
 
+#[cfg(not(target_os = "windows"))]
+mod json;
+
 pub use serializer::serialize;
diff --git a/src/serialize/serializer.rs b/src/serialize/serializer.rs
index 0287f213..2cbf5c2e 100644
--- a/src/serialize/serializer.rs
+++ b/src/serialize/serializer.rs
@@ -21,6 +21,12 @@ use serde::ser::{Serialize, SerializeMap, Serializer};
 use std::io::Write;
 use std::ptr::NonNull;
 
+#[cfg(target_os = "windows")]
+use serde_json::{to_writer, to_writer_pretty};
+
+#[cfg(not(target_os = "windows"))]
+use crate::serialize::json::{to_writer, to_writer_pretty};
+
 pub const RECURSION_LIMIT: u8 = 255;
 
 pub fn serialize(
@@ -31,9 +37,9 @@ pub fn serialize(
     let mut buf = BytesWriter::default();
     let obj = PyObjectSerializer::new(ptr, opts, 0, 0, default);
     let res = if opts & INDENT_2 != INDENT_2 {
-        crate::serialize::json::to_writer(&mut buf, &obj)
+        to_writer(&mut buf, &obj)
     } else {
-        crate::serialize::json::to_writer_pretty(&mut buf, &obj)
+        to_writer_pretty(&mut buf, &obj)
     };
     match res {
         Ok(_) => {
diff --git a/src/serialize/writer.rs b/src/serialize/writer.rs
index 1e8c0f60..09a6cb25 100644
--- a/src/serialize/writer.rs
+++ b/src/serialize/writer.rs
@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 use crate::ffi::PyBytesObject;
-use crate::serialize::json::WriteExt;
 use pyo3_ffi::*;
 use std::os::raw::c_char;
 use std::ptr::NonNull;
@@ -94,6 +93,59 @@ impl std::io::Write for BytesWriter {
     }
 }
 
+#[allow(dead_code)]
+// hack based on saethlin's research and patch in https://github.com/serde-rs/json/issues/766
+pub trait WriteExt: std::io::Write {
+    #[inline]
+    fn as_mut_buffer_ptr(&mut self) -> *mut u8 {
+        std::ptr::null_mut()
+    }
+
+    #[inline]
+    fn reserve(&mut self, len: usize) {
+        let _ = len;
+    }
+
+    #[inline]
+    fn set_written(&mut self, len: usize) {
+        let _ = len;
+    }
+
+    #[inline]
+    fn write_str(&mut self, val: &str) -> std::result::Result<(), std::io::Error> {
+        let _ = val;
+        Ok(())
+    }
+
+    #[inline]
+    unsafe fn write_reserved_fragment(
+        &mut self,
+        val: &[u8],
+    ) -> std::result::Result<(), std::io::Error> {
+        let _ = val;
+        Ok(())
+    }
+
+    #[inline]
+    unsafe fn write_reserved_punctuation(
+        &mut self,
+        val: u8,
+    ) -> std::result::Result<(), std::io::Error> {
+        let _ = val;
+        Ok(())
+    }
+
+    #[inline]
+    unsafe fn write_reserved_indent(
+        &mut self,
+        len: usize,
+    ) -> std::result::Result<(), std::io::Error> {
+        let _ = len;
+        Ok(())
+    }
+}
+
+#[allow(dead_code)]
 impl WriteExt for &mut BytesWriter {
     #[inline(always)]
     fn as_mut_buffer_ptr(&mut self) -> *mut u8 {
diff --git a/test/test_issue331.py b/test/test_issue331.py
new file mode 100644
index 00000000..1f2cda1e
--- /dev/null
+++ b/test/test_issue331.py
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+import orjson
+
+from .util import read_fixture_bytes
+
+def test_issue331_1():
+    as_bytes = read_fixture_bytes("issue331_1.json.xz")
+    as_obj = orjson.loads(as_bytes)
+    for i in range(1000):
+        assert orjson.loads(orjson.dumps(as_obj)) == as_obj
+
+def test_issue331_2():
+    as_bytes = read_fixture_bytes("issue331_2.json.xz")
+    as_obj = orjson.loads(as_bytes)
+    for i in range(1000):
+        assert orjson.loads(orjson.dumps(as_obj)) == as_obj