1 files changed, 6 insertions, 4 deletions

diff --git a/src/coding.h b/src/coding.h
index cac11d1514c..be68753acb2 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -443,10 +443,12 @@ struct coding_system
   Lisp_Object translation_table_for_encode;
 };
 
-#define CODING_REQUIRE_FLUSHING_MASK    1
-#define CODING_REQUIRE_DECODING_MASK    2
-#define CODING_REQUIRE_ENCODING_MASK    4
-#define CODING_REQUIRE_DETECTION_MASK   8
+/* Mask bits for (struct coding_system *)->common_flags.  */
+#define CODING_REQUIRE_FLUSHING_MASK    0x01
+#define CODING_REQUIRE_DECODING_MASK    0x02
+#define CODING_REQUIRE_ENCODING_MASK    0x04
+#define CODING_REQUIRE_DETECTION_MASK   0x08
+#define CODING_ASCII_INCOMPATIBLE_MASK  0x10
 
 /* Return 1 if the coding system CODING requires specific code to be
    attached at the tail of converted text.  */