diff --git a/ChangeLog b/ChangeLog
index 70106447b5..213b9c0711 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jul 19 14:19:48 2013  Kazuki Tsujimoto  <kazuki@callcc.net>
+
+	* ext/pathname/pathname.c (path_inspect): use PRIsVALUE to preserve
+	  the result encoding.
+
 Fri Jul 19 12:35:41 2013  Tanaka Akira  <akr@fsij.org>
 
 	* test/socket/test_tcp.rb (test_initialize_failure): Use EADDRNOTAVAIL
diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index 2e30ff58c0..884bd4a821 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -183,7 +183,7 @@ path_inspect(VALUE self)
 {
     const char *c = rb_obj_classname(self);
     VALUE str = get_strpath(self);
-    return rb_sprintf("#<%s:%s>", c, RSTRING_PTR(str));
+    return rb_sprintf("#<%s:%"PRIsVALUE">", c, str);
 }
 
 /*