diff --git a/Include/fileutils.h b/Include/fileutils.h
index e4bf6d4..3708784 100644
--- a/Include/fileutils.h
+++ b/Include/fileutils.h
@@ -170,6 +170,11 @@
 
 #endif   /* Py_LIMITED_API */
 
+
+#ifdef Py_BUILD_CORE
+PyAPI_FUNC(int) _Py_GetForceASCII(void);
+#endif
+
 #ifdef __cplusplus
 }
 #endif