diff --git a/ChangeLog b/ChangeLog
index 9d33441b99..0a69f653c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon May 27 00:31:09 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* tool/make-snapshot: use ENV["AUTOCONF"] instead of directly using
+	  literal "autoconf".
+
 Sun May 26 21:31:46 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* hash.c, include/ruby/ruby.h: support WB protected hash.
diff --git a/tool/make-snapshot b/tool/make-snapshot
index 2c0db91cd4..32ae1722a7 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -38,6 +38,7 @@ ENV["MV"] ||= "mv"
 ENV["RM"] ||= "rm -f"
 ENV["MINIRUBY"] ||= "ruby"
 ENV["PROGRAM"] ||= "ruby"
+ENV["AUTOCONF"] ||= "autoconf"
 
 class String
   # for older ruby
@@ -179,7 +180,7 @@ def package(rev, destdir)
     end
     unless File.exist?("configure")
       print "creating configure..."
-      unless system("autoconf")
+      unless system(ENV["AUTOCONF"])
         puts " failed"
         return
       end