diff --git a/ChangeLog b/ChangeLog
index cf78804c5d..33d8882c0f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Dec 21 01:18:06 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* error.c: Fix build error for win32. This regression was
+	  introduced by r30271.
+
 Tue Dec 21 00:59:40 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* thread.c (thread_cleanup_func): Moved interrupted_lock
diff --git a/error.c b/error.c
index d54f43c539..7c9e22b9ed 100644
--- a/error.c
+++ b/error.c
@@ -25,6 +25,14 @@
 #define EXIT_SUCCESS 0
 #endif
 
+#ifndef WIFEXITED
+#define WIFEXITED(status) 1
+#endif
+
+#ifndef WEXITSTATUS
+#define WEXITSTATUS(status) (status)
+#endif
+
 extern const char ruby_description[];
 
 static const char *