diff --git a/ChangeLog b/ChangeLog
index 93ec6d8193..83d7642eb8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Feb 26 11:10:19 2016  Rick Salevsky  <rsalevsky@suse.com>
+
+	* lib/tmpdir.rb: Unify to coding-style for method definition.
+	  [fix GH-1252]
+
 Fri Feb 26 11:02:04 2016  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* README.md: update markdown syntax for anchor tag.
diff --git a/lib/tmpdir.rb b/lib/tmpdir.rb
index e4df93c2d0..d12afa1ae6 100644
--- a/lib/tmpdir.rb
+++ b/lib/tmpdir.rb
@@ -82,7 +82,7 @@ class Dir
   #    FileUtils.remove_entry dir
   #  end
   #
-  def Dir.mktmpdir(prefix_suffix=nil, *rest)
+  def self.mktmpdir(prefix_suffix=nil, *rest)
     path = Tmpname.create(prefix_suffix || "d", *rest) {|n| mkdir(n, 0700)}
     if block_given?
       begin