1 files changed, 4 insertions, 0 deletions

diff --git a/src/buffer.h b/src/buffer.h
index 9dce1ae0a36..15f7c51f437 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -244,6 +244,10 @@ struct buffer
     Lisp_Object left_margin;
     /* Function to call when insert space past fill column */
     Lisp_Object auto_fill_function;
+#ifdef MSDOS
+    /* nil: text, t: binary.  */
+    Lisp_Object buffer_file_type;
+#endif
 
     /* String of length 256 mapping each char to its lower-case version.  */
     Lisp_Object downcase_table;