diff --git a/pythoncapi_compat.h b/pythoncapi_compat.h
index 4d28846..836df7e 100644
--- a/pythoncapi_compat.h
+++ b/pythoncapi_compat.h
@@ -37,11 +37,13 @@ extern "C" {
// Static inline functions should use _Py_NULL rather than using directly NULL
// to prevent C++ compiler warnings. On C23 and newer and on C++11 and newer,
// _Py_NULL is defined as nullptr.
-#if (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L) \
- || (defined(__cplusplus) && __cplusplus >= 201103)
-# define _Py_NULL nullptr
-#else
-# define _Py_NULL NULL
+#ifndef _Py_NULL
+# if (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L) \
+ || (defined(__cplusplus) && __cplusplus >= 201103)
+# define _Py_NULL nullptr
+# else
+# define _Py_NULL NULL
+# endif
#endif
// Cast argument to PyObject* type.
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