diff --git a/ChangeLog b/ChangeLog
index e0b9afcf04..fe6dab02b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Feb 25 07:53:49 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* dir.c (dir_inspect), io.c (rb_io_inspect): keep encoding of path.
+	  [Bug #6072]
+
 Sat Feb 25 07:53:40 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* dir.c (dir_initialize): keep path in original encoding.
diff --git a/dir.c b/dir.c
index 8383adc6f0..b0a1d9eaf5 100644
--- a/dir.c
+++ b/dir.c
@@ -485,8 +485,12 @@ dir_inspect(VALUE dir)
 
     TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dirp);
     if (!NIL_P(dirp->path)) {
-	const char *c = rb_obj_classname(dir);
-	return rb_sprintf("#<%s:%s>", c, RSTRING_PTR(dirp->path));
+	VALUE str = rb_str_new_cstr("#<");
+	rb_str_append(str, rb_class_name(CLASS_OF(dir)));
+	rb_str_cat2(str, ":");
+	rb_str_append(str, dirp->path);
+	rb_str_cat2(str, ">");
+	return str;
     }
     return rb_funcall(dir, rb_intern("to_s"), 0, 0);
 }
diff --git a/io.c b/io.c
index 04868107d5..e7116cd824 100644
--- a/io.c
+++ b/io.c
@@ -1778,31 +1778,29 @@ static VALUE
 rb_io_inspect(VALUE obj)
 {
     rb_io_t *fptr;
-    const char *cname;
-    char fd_desc[4+sizeof(int)*3];
-    const char *path;
-    const char *st = "";
+    VALUE result;
+    static const char closed[] = " (closed)";
 
     fptr = RFILE(rb_io_taint_check(obj))->fptr;
     if (!fptr) return rb_any_to_s(obj);
-    cname = rb_obj_classname(obj);
+    result = rb_str_new_cstr("#<");
+    rb_str_append(result, rb_class_name(CLASS_OF(obj)));
+    rb_str_cat2(result, ":");
     if (NIL_P(fptr->pathv)) {
         if (fptr->fd < 0) {
-            path = "";
-            st = "(closed)";
+	    rb_str_cat(result, closed+1, strlen(closed)-1);
         }
         else {
-            snprintf(fd_desc, sizeof(fd_desc), "fd %d", fptr->fd);
-            path = fd_desc;
+	    rb_str_catf(result, "fd %d", fptr->fd);
         }
     }
     else {
-        path = RSTRING_PTR(fptr->pathv);
+	rb_str_append(result, fptr->pathv);
         if (fptr->fd < 0) {
-            st = " (closed)";
+	    rb_str_cat(result, closed, strlen(closed));
         }
     }
-    return rb_sprintf("#<%s:%s%s>", cname, path, st);
+    return rb_str_cat2(result, ">");
 }
 
 /*
diff --git a/test/ruby/test_dir_m17n.rb b/test/ruby/test_dir_m17n.rb
index 1f5b03a905..b376393abf 100644
--- a/test/ruby/test_dir_m17n.rb
+++ b/test/ruby/test_dir_m17n.rb
@@ -224,5 +224,16 @@ class TestDir_M17N < Test::Unit::TestCase
     }
     assert_equal(paths.map(&:encoding), encs, bug6071)
   end
-end
 
+  def test_inspect_nonascii
+    bug6072 = '[ruby-dev:45280]'
+    paths = ["\u{3042}".encode("sjis"), "\u{ff}".encode("iso-8859-1")]
+    encs = with_tmpdir {
+      paths.map {|path|
+        Dir.mkdir(path)
+        Dir.open(path) {|d| d.inspect.encoding}
+      }
+    }
+    assert_equal(paths.map(&:encoding), encs, bug6072)
+  end
+end
diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index 02e60fb62f..d8916433ad 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -2367,4 +2367,15 @@ EOT
     }
     assert_equal(paths.map(&:encoding), encs, bug6071)
   end
+
+  def test_inspect_nonascii
+    bug6072 = '[ruby-dev:45280]'
+    paths = ["\u{3042}".encode("sjis"), "\u{ff}".encode("iso-8859-1")]
+    encs = with_tmpdir {
+      paths.map {|path|
+        open(path, "wb") {|f| f.inspect.encoding}
+      }
+    }
+    assert_equal(paths.map(&:encoding), encs, bug6072)
+  end
 end