diff --git a/ChangeLog b/ChangeLog
index 2ccf739..2d94135 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+015-07-07  Feng Gao  <gfree.wind@gmail.com>
+	* libio/fileops.c: Use "|" instead of "+" when combine _IO_LINE_BUF
+	and _IO_UNBUFFERED
+	* libio/oldfileops.c: Likewise
+	* libio/wfileops.c: Likewise
+
 2015-07-07  Pavel Kopyl  <p.kopyl@samsung.com>
 	    Mikhail Ilin  <m.ilin@samsung.com>
 
diff --git a/libio/fileops.c b/libio/fileops.c
index 9668024..cbcd6f5 100644
--- a/libio/fileops.c
+++ b/libio/fileops.c
@@ -521,7 +521,7 @@ new_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do)
   _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
   fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base;
   fp->_IO_write_end = (fp->_mode <= 0
-		       && (fp->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
+		       && (fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
 		       ? fp->_IO_buf_base : fp->_IO_buf_end);
   return count;
 }
@@ -844,7 +844,7 @@ _IO_new_file_overflow (_IO_FILE *f, int ch)
       f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;
 
       f->_flags |= _IO_CURRENTLY_PUTTING;
-      if (f->_mode <= 0 && f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
+      if (f->_mode <= 0 && f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
 	f->_IO_write_end = f->_IO_write_ptr;
     }
   if (ch == EOF)
diff --git a/libio/oldfileops.c b/libio/oldfileops.c
index 84939e3..54789b2 100644
--- a/libio/oldfileops.c
+++ b/libio/oldfileops.c
@@ -313,7 +313,7 @@ old_do_write (fp, data, to_do)
     fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1;
   _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
   fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base;
-  fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
+  fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
 		       ? fp->_IO_buf_base : fp->_IO_buf_end);
   return count;
 }
@@ -418,7 +418,7 @@ _IO_old_file_overflow (f, ch)
       f->_IO_write_end = f->_IO_buf_end;
       f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;
 
-      if (f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
+      if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
 	f->_IO_write_end = f->_IO_write_ptr;
       f->_flags |= _IO_CURRENTLY_PUTTING;
     }
diff --git a/libio/wfileops.c b/libio/wfileops.c
index 73d7709..99f9c8f 100644
--- a/libio/wfileops.c
+++ b/libio/wfileops.c
@@ -118,7 +118,7 @@ _IO_wdo_write (_IO_FILE *fp, const wchar_t *data, _IO_size_t to_do)
 	     fp->_wide_data->_IO_buf_base);
   fp->_wide_data->_IO_write_base = fp->_wide_data->_IO_write_ptr
     = fp->_wide_data->_IO_buf_base;
-  fp->_wide_data->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
+  fp->_wide_data->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
 				   ? fp->_wide_data->_IO_buf_base
 				   : fp->_wide_data->_IO_buf_end);
 
@@ -216,7 +216,7 @@ _IO_wfile_underflow (_IO_FILE *fp)
 
   /* Flush all line buffered files before reading. */
   /* FIXME This can/should be moved to genops ?? */
-  if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED))
+  if (fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
     {
 #if 0
       _IO_flush_all_linebuffered ();
@@ -477,7 +477,7 @@ _IO_wfile_overflow (_IO_FILE *f, wint_t wch)
       f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;
 
       f->_flags |= _IO_CURRENTLY_PUTTING;
-      if (f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
+      if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
 	f->_wide_data->_IO_write_end = f->_wide_data->_IO_write_ptr;
     }
   if (wch == WEOF)