diff --git a/ChangeLog b/ChangeLog
index afb57284c0..5c92184198 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Mar  3 17:15:09 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* re.c (rb_reg_regsub): remove too strict encoding check.
+	  [ruby-dev:33966]
+
 Mon Mar  3 16:14:24 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* hash.c (rb_any_hash): shrinks all results in Fixnum range.
diff --git a/re.c b/re.c
index 61f6990d04..49424eb632 100644
--- a/re.c
+++ b/re.c
@@ -2960,7 +2960,6 @@ rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
     rb_encoding *str_enc = rb_enc_get(str);
     rb_encoding *src_enc = rb_enc_get(src);
 
-    rb_enc_check(str, src);
     p = s = RSTRING_PTR(str);
     e = s + RSTRING_LEN(str);
 
diff --git a/test/ruby/test_m17n_comb.rb b/test/ruby/test_m17n_comb.rb
index e69d6fadc8..ca527cc807 100644
--- a/test/ruby/test_m17n_comb.rb
+++ b/test/ruby/test_m17n_comb.rb
@@ -1417,7 +1417,6 @@ class TestM17NComb < Test::Unit::TestCase
           assert_equal(s1, doit.call)
           next
         end
-        assert(false, "test broken")
         if !str_enc_compatible?(s1.gsub(r2, ''), s3)
           assert_raise(ArgumentError, desc) { doit.call }
           next
@@ -1472,7 +1471,6 @@ class TestM17NComb < Test::Unit::TestCase
           assert_equal([s1, nil], doit.call)
           next
         end
-        assert(false, "test broken")
         if !str_enc_compatible?(s1.gsub(r2, ''), s3)
           assert_raise(ArgumentError, desc) { doit.call }
           next