1 files changed, 7 insertions, 3 deletions

diff --git a/src/coding.h b/src/coding.h
index b01f0d2c01f..f0a5fa4c04e 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -144,8 +144,9 @@ enum iso_code_class_type
 #define CODING_FLAG_ISO_DESIGNATION     0x10000
 
 /* A character to be produced on output if encoding of the original
-   character is prohibited by CODING_FLAG_ISO_SAFE.  */
-#define CODING_INHIBIT_CHARACTER_SUBSTITUTION  077 /* 077 == `?' */
+   character is inhibitted by CODING_MODE_INHIBIT_UNENCODABLE_CHAR.
+   It must be an ASCII character.  */
+#define CODING_REPLACEMENT_CHARACTER '?'
 
 /* Structure of the field `spec.iso2022' in the structure `coding_system'.  */
 struct iso2022_spec
@@ -337,9 +338,12 @@ struct composition_data
    enables selective display.  */
 #define CODING_MODE_SELECTIVE_DISPLAY           0x04
 
+/* If set, replace unencodabae characters by `?' on encoding.  */
+#define CODING_MODE_INHIBIT_UNENCODABLE_CHAR    0x08
+
 /* This flag is used by the decoding/encoding routines on the fly.  If
    set, it means that right-to-left text is being processed.  */
-#define CODING_MODE_DIRECTION                   0x08
+#define CODING_MODE_DIRECTION                   0x10
 
 struct coding_system
 {