diff --git a/ChangeLog b/ChangeLog
index 7a68b94ee6..0e06c6f707 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Mar 13 23:00:02 2009  Tanaka Akira  <akr@fsij.org>
+
+	* configure.in (RUBY_CHECK_SIZEOF): pass [include] to AC_CHECK_SIZEOF.
+
 Fri Mar 13 20:58:11 2009  Tanaka Akira  <akr@fsij.org>
 
 	* dln.c (dln_find_1): compare fspace in size_t world.
diff --git a/configure.in b/configure.in
index f1400a842a..36f2580ae9 100644
--- a/configure.in
+++ b/configure.in
@@ -428,7 +428,7 @@ ${cond+@%:@endif}
     ${cond+echo "@%:@endif"}
 } >> confdefs.h
 else
-AC_CHECK_SIZEOF([$1])
+AC_CHECK_SIZEOF([$1], 0, [$4])
 fi
 ])