diff --git a/crates/jiter/src/py_string_cache.rs b/crates/jiter/src/py_string_cache.rs
index 96dcf66..21e6979 100644
--- a/crates/jiter/src/py_string_cache.rs
+++ b/crates/jiter/src/py_string_cache.rs
@@ -200,7 +200,7 @@ pub fn pystring_fast_new<'py>(py: Python<'py>, s: &str, ascii_only: bool) -> Bou
 
 /// Faster creation of PyString from an ASCII string, inspired by
 /// https://github.com/ijl/orjson/blob/3.10.0/src/str/create.rs#L41
-#[cfg(not(PyPy))]
+#[cfg(all(not(PyPy), not(GraalPy)))]
 unsafe fn pystring_ascii_new<'py>(py: Python<'py>, s: &str) -> Bound<'py, PyString> {
     let ptr = pyo3::ffi::PyUnicode_New(s.len() as isize, 127);
     // see https://github.com/pydantic/jiter/pull/72#discussion_r1545485907
@@ -212,7 +212,7 @@ unsafe fn pystring_ascii_new<'py>(py: Python<'py>, s: &str) -> Bound<'py, PyStri
 }
 
 // ffi::PyUnicode_DATA seems to be broken for pypy, hence this, marked as unsafe to avoid warnings
-#[cfg(PyPy)]
+#[cfg(any(PyPy, GraalPy))]
 unsafe fn pystring_ascii_new<'py>(py: Python<'py>, s: &str) -> Bound<'py, PyString> {
     PyString::new_bound(py, s)
 }