diff --git a/ChangeLog b/ChangeLog
index 291a1bbe05..085c5a5bb9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jul 26 14:38:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (XCFLAGS): missing.h needs config.h.
+
 Mon Jul 26 14:08:47 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* include/ruby/missing.h: revert a part of r28727.  config.h is expected
diff --git a/configure.in b/configure.in
index bf86c7fa6b..a8aab4415c 100644
--- a/configure.in
+++ b/configure.in
@@ -272,7 +272,7 @@ if test "$GCC" = yes; then
     linker_flag=-Wl,
     : ${optflags=-O3}
     AS_CASE(["$target_os"], [linux*|darwin*], [: ${debugflags=-ggdb}])
-    RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/missing.h"])
+    RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/config.h" "-include ruby/missing.h"])
 else
     linker_flag=
 fi