diff --git a/ChangeLog b/ChangeLog
index 886aa07402..364957df3f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May 18 11:59:25 2014  Tanaka Akira  <akr@fsij.org>
+
+	* missing/nextafter.c: Include ruby/missing.h.
+
 Sun May 18 11:09:28 2014  Tanaka Akira  <akr@fsij.org>
 
 	* win32/Makefile.sub: Add nextafter.obj to MISSING.
diff --git a/missing/nextafter.c b/missing/nextafter.c
index 116a0d376b..dd1f1f2319 100644
--- a/missing/nextafter.c
+++ b/missing/nextafter.c
@@ -1,3 +1,5 @@
+#include "ruby/missing.h"
+
 #include <math.h>
 #include <float.h>