diff --git a/ChangeLog b/ChangeLog
index 47bcf99dc2..6df87cb716 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Feb 23 23:01:21 2012  Tanaka Akira  <akr@fsij.org>
+
+	* ext/dbm/extconf.rb: unused macro removed.
+
 Thu Feb 23 22:26:53 2012  Tanaka Akira  <akr@fsij.org>
 
 	* test/test_curses.rb: new file.
diff --git a/ext/dbm/extconf.rb b/ext/dbm/extconf.rb
index 00ac1a804c..d0c97a087a 100644
--- a/ext/dbm/extconf.rb
+++ b/ext/dbm/extconf.rb
@@ -99,7 +99,6 @@ def try_toplevel(src, headers = nil, opt = "", &b)
 /*top*/
 #{src}
 SRC
-    $defs.push("-DHAVE_EMPTY_MACRO_DBM_CLEARERR")
     true
   else
     false