diff --git a/src/input/return_enums.rs b/src/input/return_enums.rs
index 9722669cc..22faaba71 100644
--- a/src/input/return_enums.rs
+++ b/src/input/return_enums.rs
@@ -549,6 +549,7 @@ impl<'a> EitherInt<'a> {
             Ok(Self::BigInt(big_int))
         }
     }
+
     pub fn into_i64(self, py: Python<'a>) -> ValResult<i64> {
         match self {
             EitherInt::I64(i) => Ok(i),
diff --git a/src/validators/literal.rs b/src/validators/literal.rs
index 9c4eb7292..16eef090d 100644
--- a/src/validators/literal.rs
+++ b/src/validators/literal.rs
@@ -4,7 +4,7 @@ use core::fmt::Debug;
 use std::cmp::Ordering;
 
 use pyo3::prelude::*;
-use pyo3::types::{PyDict, PyList};
+use pyo3::types::{PyDict, PyInt, PyList};
 use pyo3::{intern, PyTraverseError, PyVisit};
 
 use ahash::AHashMap;
@@ -58,11 +58,13 @@ impl<T: Debug> LiteralLookup<T> {
                     expected_bool.false_id = Some(id);
                 }
             }
-            if let Ok(either_int) = k.exact_int() {
-                let int = either_int
-                    .into_i64(py)
-                    .map_err(|_| py_schema_error_type!("error extracting int {:?}", k))?;
-                expected_int.insert(int, id);
+            if k.is_exact_instance_of::<PyInt>() {
+                if let Ok(int_64) = k.extract::<i64>() {
+                    expected_int.insert(int_64, id);
+                } else {
+                    // cover the case of an int that's > i64::MAX etc.
+                    expected_py_dict.set_item(k, id)?;
+                }
             } else if let Ok(either_str) = k.exact_str() {
                 let str = either_str
                     .as_cow()
diff --git a/tests/validators/test_enums.py b/tests/validators/test_enums.py
index 91701ce74..a4fb3c5c2 100644
--- a/tests/validators/test_enums.py
+++ b/tests/validators/test_enums.py
@@ -1,6 +1,6 @@
 import re
 import sys
-from enum import Enum, IntFlag
+from enum import Enum, IntEnum, IntFlag
 
 import pytest
 
@@ -331,3 +331,16 @@ class MyFlags(IntFlag):
 
     with pytest.raises(ValidationError):
         v.validate_python(None)
+
+
+def test_big_int():
+    class ColorEnum(IntEnum):
+        GREEN = 1 << 63
+        BLUE = 1 << 64
+
+    v = SchemaValidator(
+        core_schema.with_default_schema(schema=core_schema.enum_schema(ColorEnum, list(ColorEnum.__members__.values())))
+    )
+
+    assert v.validate_python(ColorEnum.GREEN) is ColorEnum.GREEN
+    assert v.validate_python(1 << 63) is ColorEnum.GREEN
diff --git a/tests/validators/test_literal.py b/tests/validators/test_literal.py
index d294f866c..5f9f942e2 100644
--- a/tests/validators/test_literal.py
+++ b/tests/validators/test_literal.py
@@ -378,3 +378,14 @@ class Foo(str, Enum):
     with pytest.raises(ValidationError) as exc_info:
         v.validate_python('bar_val')
     assert exc_info.value.errors(include_url=False) == err
+
+
+def test_big_int():
+    big_int = 2**64 + 1
+    massive_int = 2**128 + 1
+    v = SchemaValidator(core_schema.literal_schema([big_int, massive_int]))
+    assert v.validate_python(big_int) == big_int
+    assert v.validate_python(massive_int) == massive_int
+    m = r'Input should be 18446744073709551617 or 340282366920938463463374607431768211457 \[type=literal_error'
+    with pytest.raises(ValidationError, match=m):
+        v.validate_python(37)