diff --git a/ChangeLog b/ChangeLog
index d2c9b2d487..35ed5af009 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jul 25 14:46:14 2006  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/mkmf.rb (configuration): typo.
+
 Tue Jul 25 13:14:32 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* process.c (rb_proc_times): rename hz to hertz to avoid name
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 8b2115eb65..575f774920 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -948,7 +948,7 @@ topdir = #{($extmk ? CONFIG["topdir"] : $topdir).quote}
 hdrdir = #{$extmk ? CONFIG["hdrdir"].quote : '$(topdir)'}
 VPATH = #{vpath.join(CONFIG['PATH_SEPARATOR'])}
 }
-  if $destdir = CONFIG["prefix"][$dest_prefix_pattern, 1]
+  if destdir = CONFIG["prefix"][$dest_prefix_pattern, 1]
     mk << "\nDESTDIR = #{destdir}\n"
   end
   CONFIG.each do |key, var|