diff --git a/ChangeLog b/ChangeLog
index cb944c7bf9..61a83a227a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,9 +1,15 @@
+Sun Dec 27 21:14:42 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* process.c (rb_execarg_parent_start1): need to convert the encoding to
+	  ospath's one.
+
 Sun Dec 27 20:54:22 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* process.c: use rb_w32_uchdir() instead of plain chdir() on Windows.
 	  reported by naruse via twitter.
 
-	* process.c (rb_execarg_addopt): need to convert to ospath.
+	* process.c (rb_execarg_addopt): need to convert the encoding to
+	  ospath's one.
 
 Sun Dec 27 20:00:31 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
diff --git a/process.c b/process.c
index fdf75ee019..e196639b87 100644
--- a/process.c
+++ b/process.c
@@ -2314,6 +2314,7 @@ rb_execarg_parent_start1(VALUE execarg_obj)
             if (NIL_P(fd2v)) {
                 struct open_struct open_data;
                 FilePathValue(vpath);
+		vpath = rb_str_encode_ospath(vpath);
               again:
                 open_data.fname = vpath;
                 open_data.oflags = flags;