diff --git a/vm/src/obj/objint.rs b/vm/src/obj/objint.rs
index e19c4f9c7..0c58ccca2 100644
--- a/vm/src/obj/objint.rs
+++ b/vm/src/obj/objint.rs
@@ -6,7 +6,7 @@ use num_integer::Integer;
 use num_traits::{Num, One, Pow, Signed, ToPrimitive, Zero};
 
 use crate::format::FormatSpec;
-use crate::function::{KwArgs, OptionalArg, PyFuncArgs};
+use crate::function::{OptionalArg, PyFuncArgs};
 use crate::obj::objtype::PyClassRef;
 use crate::pyhash;
 use crate::pyobject::{
@@ -603,36 +603,30 @@ impl PyInt {
         };
         Ok(x)
     }
+
     #[pymethod]
     #[allow(clippy::match_bool)]
-    fn to_bytes(
-        &self,
-        length: PyIntRef,
-        byteorder: PyStringRef,
-        kwargs: KwArgs,
-        vm: &VirtualMachine,
-    ) -> PyResult<PyBytes> {
-        let mut signed = false;
+    fn to_bytes(&self, options: IntToByteOptions, vm: &VirtualMachine) -> PyResult<PyBytes> {
+        let signed = if let OptionalArg::Present(signed) = options.signed {
+            signed.to_bool()
+        } else {
+            false
+        };
+
         let value = self.as_bigint();
-        for (key, value) in kwargs.into_iter() {
-            if key == "signed" {
-                signed = match_class!(match value {
-                    b @ PyInt => !b.as_bigint().is_zero(),
-                    _ => false,
-                });
-            }
-        }
         if value.sign() == Sign::Minus && !signed {
             return Err(vm.new_overflow_error("can't convert negative int to unsigned".to_string()));
         }
-        let byte_len;
-        if let Some(temp) = length.as_bigint().to_usize() {
-            byte_len = temp;
-        } else {
-            return Err(vm.new_value_error("length parameter is illegal".to_string()));
-        }
 
-        let mut origin_bytes = match byteorder.as_str() {
+        let byte_len = if let Some(byte_len) = options.length.as_bigint().to_usize() {
+            byte_len
+        } else {
+            return Err(
+                vm.new_overflow_error("Python int too large to convert to C ssize_t".to_string())
+            );
+        };
+
+        let mut origin_bytes = match options.byteorder.as_str() {
             "big" => match signed {
                 true => value.to_signed_bytes_be(),
                 false => value.to_bytes_be().1,
@@ -647,17 +641,19 @@ impl PyInt {
                 );
             }
         };
+
         let origin_len = origin_bytes.len();
         if origin_len > byte_len {
-            return Err(vm.new_value_error("int too big to convert".to_string()));
+            return Err(vm.new_overflow_error("int too big to convert".to_string()));
         }
 
         let mut append_bytes = match value.sign() {
             Sign::Minus => vec![255u8; byte_len - origin_len],
             _ => vec![0u8; byte_len - origin_len],
         };
+
         let mut bytes = vec![];
-        match byteorder.as_str() {
+        match options.byteorder.as_str() {
             "big" => {
                 bytes = append_bytes;
                 bytes.append(&mut origin_bytes);
@@ -668,7 +664,6 @@ impl PyInt {
             }
             _ => (),
         }
-
         Ok(PyBytes::new(bytes))
     }
     #[pyproperty]
@@ -738,6 +733,16 @@ struct IntFromByteOptions {
     signed: OptionalArg<IntoPyBool>,
 }
 
+#[derive(FromArgs)]
+struct IntToByteOptions {
+    #[pyarg(positional_or_keyword)]
+    length: PyIntRef,
+    #[pyarg(positional_or_keyword)]
+    byteorder: PyStringRef,
+    #[pyarg(keyword_only, optional = true)]
+    signed: OptionalArg<IntoPyBool>,
+}
+
 // Casting function:
 pub fn to_int(vm: &VirtualMachine, obj: &PyObjectRef, base: &BigInt) -> PyResult<BigInt> {
     let base_u32 = match base.to_u32() {