diff --git a/Include/fileobject.h b/Include/fileobject.h
index 40d871a..0f40089 100644
--- a/Include/fileobject.h
+++ b/Include/fileobject.h
@@ -20,6 +20,7 @@
    If non-NULL, this is different than the default encoding for strings
 */
 PyAPI_DATA(const char *) Py_FileSystemDefaultEncoding;
+PyAPI_DATA(const int) Py_HasFileSystemDefaultEncoding;
 
 /* Internal API