diff --git a/ChangeLog b/ChangeLog
index cd6fc15767..75f1a1a14c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-31  Zack Weinberg  <zackw@panix.com>
+
+	* libio/bits/libio-ldbl.h: Correct check for improper
+	inclusion.  Add own multiple include guard.
+
 2017-12-30  Aurelien Jarno  <aurelien@aurel32.net>
 	    Dmitry V. Levin  <ldv@altlinux.org>
 
diff --git a/libio/bits/libio-ldbl.h b/libio/bits/libio-ldbl.h
index f238550e4b..b5fd97e359 100644
--- a/libio/bits/libio-ldbl.h
+++ b/libio/bits/libio-ldbl.h
@@ -16,9 +16,14 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef _IO_STDIO_H
+#ifndef _BITS_LIBIO_LDBL_H
+#define _BITS_LIBIO_LDBL_H 1
+
+#ifndef _BITS_LIBIO_H
 # error "Never include <bits/libio-ldbl.h> directly; use <libio.h> instead."
 #endif
 
 __LDBL_REDIR_DECL (_IO_vfscanf)
 __LDBL_REDIR_DECL (_IO_vfprintf)
+
+#endif