diff --git a/ChangeLog b/ChangeLog
index df5b4cfb38..a338710cc9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Feb  5 16:33:50 2006  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
+
+	* lib/mkmf.rb (create_makefile): Kernel#sub! was removed on HEAD.
+
 Sun Feb  5 14:26:54 2006  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
 
 	* lib/pstore.rb: should return default value if name is not found.
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 5afe5017d1..cd5b5b7e12 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1051,7 +1051,7 @@ def create_makefile(target, srcprefix = nil)
     if File.exist?(File.join(srcdir, target + '.def'))
       deffile = "$(srcdir)/$(TARGET).def"
       unless EXPORT_PREFIX.empty?
-        makedef = %{-pe "sub!(/^(?=\\w)/,'#{EXPORT_PREFIX}') unless 1../^EXPORTS$/i"}
+        makedef = %{-pe "$_.sub!(/^(?=\\w)/,'#{EXPORT_PREFIX}') unless 1../^EXPORTS$/i"}
       end
     else
       makedef = %{-e "puts 'EXPORTS', '#{EXPORT_PREFIX}Init_$(TARGET)'"}