diff --git a/ChangeLog b/ChangeLog
index 41e886f0f9..2b1569cbf0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Nov 21 00:28:18 2012  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* test/ruby/test_m17n_comb.rb (test_str_crypt): Use RbConfig to get
+	  libc's directory. Patched by Vit Ondruch [ruby-core:49763] [Bug #7312]
+
 Tue Nov 20 23:28:26 2012  Masaki Matsushita  <glass.saga@gmail.com>
 
 	* marshal.c: add marshal readahead. marshalized Array, Hash and Struct
diff --git a/test/ruby/test_m17n_comb.rb b/test/ruby/test_m17n_comb.rb
index 903e0de134..904c6095e7 100644
--- a/test/ruby/test_m17n_comb.rb
+++ b/test/ruby/test_m17n_comb.rb
@@ -722,7 +722,7 @@ class TestM17NComb < Test::Unit::TestCase
   def test_str_crypt
     begin
       # glibc 2.16 or later denies salt contained other than [0-9A-Za-z./] #7312
-      glibcver = `/lib/libc.so.6`[/\AGNU C Library.*version ([0-9.]+)/, 1].split('.').map(&:to_i)
+      glibcver = `#{RbConfig::CONFIG["libdir"]}/libc.so.6`[/\AGNU C Library.*version ([0-9.]+)/, 1].split('.').map(&:to_i)
       strict_crypt = (glibcver <=> [2, 16]) > -1
     rescue
     end