diff --git a/libio/strfile.h b/libio/strfile.h
index 5a33dca22d9..85e83a95d07 100644
--- a/libio/strfile.h
+++ b/libio/strfile.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU IO Library.
 
    This library is free software; you can redistribute it and/or
@@ -28,6 +28,14 @@
 Merge into  libio.h ?
 #endif
 
+#ifndef __PMT
+# ifdef __STDC__
+#  define __PMT(p) p
+# else
+#  define __PMT(p) ()
+# endif
+#endif /*!__P*/
+
 typedef void *(*_IO_alloc_type) __PMT ((_IO_size_t));
 typedef void (*_IO_free_type) __PMT ((void*));