diff --git a/ChangeLog b/ChangeLog
index bbb2a8a3ef..2997714fb5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Thu Apr 28 06:06:56 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* io.c (rb_io_extract_modeenc, rb_f_backquote): set default text
+	  mode.  fixes #4619
+
+	* io.c (pipe_open): set universal newline decorator if needed.
+
 Wed Apr 27 11:33:08 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* enc/trans/emoji_iso2022_kddi.trans: ISO-2022-JP-KDDI doesn't have
diff --git a/io.c b/io.c
index 73a30cd305..328abc7ea8 100644
--- a/io.c
+++ b/io.c
@@ -4496,7 +4496,7 @@ rb_io_extract_modeenc(VALUE *vmode_p, VALUE *vperm_p, VALUE opthash,
     rb_io_ext_int_to_encs(NULL, NULL, &enc, &enc2);
 
     if (NIL_P(vmode)) {
-        fmode = FMODE_READABLE;
+        fmode = FMODE_READABLE | DEFAULT_TEXTMODE;
         oflags = O_RDONLY;
     }
     else if (!NIL_P(intmode = rb_check_to_integer(vmode, "to_int"))) {
@@ -5249,6 +5249,9 @@ pipe_open(struct rb_exec_arg *eargp, VALUE prog, const char *modestr, int fmode,
     if (convconfig) {
         fptr->encs = *convconfig;
     }
+    else if (NEED_NEWLINE_DECORATOR_ON_READ(fptr)) {
+        fptr->encs.ecflags |= ECONV_UNIVERSAL_NEWLINE_DECORATOR;
+    }
     fptr->pid = pid;
 
     if (0 <= write_fd) {
@@ -7248,7 +7251,7 @@ rb_f_backquote(VALUE obj, VALUE str)
     rb_io_t *fptr;
 
     SafeStringValue(str);
-    port = pipe_open_s(str, "r", FMODE_READABLE, NULL);
+    port = pipe_open_s(str, "r", FMODE_READABLE|DEFAULT_TEXTMODE, NULL);
     if (NIL_P(port)) return rb_str_new(0,0);
 
     GetOpenFile(port, fptr);