diff --git a/ChangeLog b/ChangeLog
index 440bde2496..55238ee24b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+Mon Dec 22 09:54:43 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* parse.y (gettable_gen): the encoding of __FILE__ should be
+	  rb_filesystem_encoding().  [ruby-list:45733]
+
+	* parse.y (gettable_gen): __FILE__ should be ASCII-8BIT when
+	  filesystem encoding is US-ASCII and __FILE__ contains non 7bit
+	  characters.
+
 Mon Dec 22 02:54:56 2008  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/lib/tk.rb: temporary patch for trouble on TkAqua (> Tk8.4.9).
diff --git a/parse.y b/parse.y
index ceb3b93417..f99277ec97 100644
--- a/parse.y
+++ b/parse.y
@@ -7923,7 +7923,13 @@ gettable_gen(struct parser_params *parser, ID id)
 	return NEW_FALSE();
     }
     else if (id == keyword__FILE__) {
-	return NEW_STR(STR_NEW2(ruby_sourcefile));
+	VALUE str = rb_external_str_new_with_enc(ruby_sourcefile, strlen(ruby_sourcefile),
+						 rb_filesystem_encoding());
+	if (rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT &&
+	    ENCODING_GET(str) == rb_usascii_encindex()) {
+	    rb_enc_associate(str, rb_ascii8bit_encoding());
+	}
+	return NEW_STR(str);
     }
     else if (id == keyword__LINE__) {
 	return NEW_LIT(INT2FIX(ruby_sourceline));