diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index c0e43e0..44d51c9 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -791,11 +791,9 @@
     if (size < 0)
         return _io_FileIO_readall_impl(self);
 
-#ifdef MS_WINDOWS
-    /* On Windows, the count parameter of read() is an int */
-    if (size > INT_MAX)
-        size = INT_MAX;
-#endif
+    if (size > _PY_READ_MAX) {
+        size = _PY_READ_MAX;
+    }
 
     bytes = PyBytes_FromStringAndSize(NULL, size);
     if (bytes == NULL)