diff --git a/ChangeLog b/ChangeLog
index 51cb317d8f..45385f3fff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Feb  2 01:24:34 2012  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* parse.y (debug_lines, coverage): set file path encoding for coverage
+	  result.  [ruby-dev:44950]
+
 Wed Feb  1 14:38:31 2012  Akinori MUSHA  <knu@iDaemons.org>
 
 	* lib/tempfile.rb (Tempfile#unlink, Tempfile::Remover#call): Just
diff --git a/parse.y b/parse.y
index 1ad9d62265..82eb3d406a 100644
--- a/parse.y
+++ b/parse.y
@@ -5736,7 +5736,7 @@ debug_lines(const char *f)
     if (rb_const_defined_at(rb_cObject, script_lines)) {
 	VALUE hash = rb_const_get_at(rb_cObject, script_lines);
 	if (RB_TYPE_P(hash, T_HASH)) {
-	    VALUE fname = rb_str_new2(f);
+	    VALUE fname = rb_external_str_new_with_enc(f, strlen(f), rb_filesystem_encoding());
 	    VALUE lines = rb_ary_new();
 	    rb_hash_aset(hash, fname, lines);
 	    return lines;
@@ -5750,7 +5750,7 @@ coverage(const char *f, int n)
 {
     VALUE coverages = rb_get_coverages();
     if (RTEST(coverages) && RBASIC(coverages)->klass == 0) {
-	VALUE fname = rb_str_new2(f);
+	VALUE fname = rb_external_str_new_with_enc(f, strlen(f), rb_filesystem_encoding());
 	VALUE lines = rb_ary_new2(n);
 	int i;
 	RBASIC(lines)->klass = 0;