diff --git a/ChangeLog b/ChangeLog
index 527149d134..0ed53c3aa9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Dec  8 23:26:11 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/extmk.rb (extract_makefile): should sort after map, not before
+	  it.  in this case there is no difference, but we should write better
+	  code.  this bad smell was caught by nagachika.
+
 Thu Dec  8 22:31:13 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* ext/extmk.rb (extract_makefile): need to sort the array of current
diff --git a/ext/extmk.rb b/ext/extmk.rb
index ca32da30c6..0eb9d0a10f 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -73,7 +73,7 @@ def extract_makefile(makefile, keep = true)
     end
     return false
   end
-  srcs = Dir[File.join($srcdir, "*.{#{SRC_EXT.join(%q{,})}}")].sort.map {|fn| File.basename(fn)}
+  srcs = Dir[File.join($srcdir, "*.{#{SRC_EXT.join(%q{,})}}")].map {|fn| File.basename(fn)}.sort
   if !srcs.empty?
     old_srcs = m[/^ORIG_SRCS[ \t]*=[ \t](.*)/, 1] or return false
     old_srcs.split.sort == srcs or return false