diff --git a/ChangeLog b/ChangeLog
index b18332312a..eb4aa06c5f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jun 10 22:54:18 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* missing.h: fd_set stuffs need sys/types.h.  fixed: [ruby-core:05179]
+
 Thu Jun  9 23:58:12 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/Win32API/Win32API.c (Win32API_Call): disable global
diff --git a/missing.h b/missing.h
index ac499bd7d7..ecd357ef7d 100644
--- a/missing.h
+++ b/missing.h
@@ -21,6 +21,9 @@ struct timeval {
     time_t tv_usec;	/* microseconds */
 };
 #endif
+#if defined(HAVE_SYS_TYPES_H)
+#  include <sys/types.h>
+#endif
 
 #ifndef HAVE_ACOSH
 extern double acosh _((double));