diff --git a/pythoncapi_compat.h b/pythoncapi_compat.h
index 7dd3ca2..16935df 100644
--- a/pythoncapi_compat.h
+++ b/pythoncapi_compat.h
@@ -1300,7 +1300,7 @@ PyList_GetItemRef(PyObject *op, Py_ssize_t index)
 
 // gh-114329 added PyList_GetItemRef() to Python 3.13.0a4
 #if PY_VERSION_HEX < 0x030D00A4
-static int
+static inline int
 PyDict_SetDefaultRef(PyObject *d, PyObject *key, PyObject *default_value,
                      PyObject **result)
 {