diff --git a/ChangeLog b/ChangeLog
index cb0ff8e1eb..68ba3a8416 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Thu Nov 26 21:14:30 2009  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
+
+	* test/ruby/test_complex.rb (@unify): fix the detection if math
+	  loaded. This makes test_complex.rb work fine with the previous
+	  commit.
+
+	* test/ruby/test_rational.rb (@unify): ditto.
+
 Thu Nov 26 21:13:36 2009  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* test/test_mathn.rb (TestMathn): new test case.
diff --git a/test/ruby/test_complex.rb b/test/ruby/test_complex.rb
index 6885294f84..6706b5b39f 100644
--- a/test/ruby/test_complex.rb
+++ b/test/ruby/test_complex.rb
@@ -9,7 +9,8 @@ class Complex_Test < Test::Unit::TestCase
     if @rational
       @keiju = Rational.instance_variable_get('@RCS_ID')
     end
-    @unify = $".grep(/mathn/).size != 0
+    seps = [File::SEPARATOR, File::ALT_SEPARATOR].compact.map{|x| Regexp.escape(x)}.join("|")
+    @unify = $".grep(/(?:^|#{seps})mathn(?:\.(?:rb|so))?/).size != 0
   end
 
   def test_compsub
diff --git a/test/ruby/test_rational.rb b/test/ruby/test_rational.rb
index 274a6eb33f..705f712bd3 100644
--- a/test/ruby/test_rational.rb
+++ b/test/ruby/test_rational.rb
@@ -9,7 +9,8 @@ class Rational_Test < Test::Unit::TestCase
     if @complex
       @keiju = Complex.instance_variable_get('@RCS_ID')
     end
-    @unify = $".grep(/mathn/).size != 0
+    seps = [File::SEPARATOR, File::ALT_SEPARATOR].compact.map{|x| Regexp.escape(x)}.join("|")
+    @unify = $".grep(/(?:^|#{seps})mathn(?:\.(?:rb|so))?/).size != 0
   end
 
   def test_ratsub